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Why Am I Always Cold? 8 Possible Causes of Cold Sensitivity & What You Can Do
Feeling cold and freezing all the time may seem normal. But cold sensitivity may be a sign of a health issue.
Written by
Mito Health
Why You Always Feel Cold (and When It's More Than Just a Quirk)
You wear a sweater in July. Your coworkers joke about how you always have a blanket at your desk. Your hands and feet feel like ice even when the room is perfectly comfortable for everyone else. Sound familiar?
If you are constantly feeling cold, you are not imagining it, and it is not just "being a cold person." Persistent cold sensitivity, known medically as cold intolerance, often signals that something measurable is happening inside your body. Your normal core body temperature sits around 98.6 degrees Fahrenheit (37 degrees Celsius), though healthy individuals can range from about 97 to 99 degrees Fahrenheit. When your internal thermostat struggles to maintain that range, or when blood flow to your extremities drops, you feel it as a constant, nagging chill.
The encouraging news? Most causes of cold intolerance show up clearly on routine blood tests. Once you know what is driving your symptoms, you can address the root cause rather than just piling on extra layers.
Below are nine medical causes of chronic cold sensitivity, the specific blood tests that detect each one, and actionable steps you can take today.
9 Medical Causes of Always Feeling Cold
1. Hypothyroidism
Hypothyroidism is the single most common hormonal cause of cold intolerance, and it affects roughly 5 percent of the adult population. Your thyroid gland produces hormones (T3 and T4) that act as the master switch for your metabolism. When production drops, your metabolic rate slows down, and your body generates less heat from food and activity. The result: you feel cold even in a warm room, you gain weight without eating more, and fatigue follows you everywhere.
According to the American Thyroid Association clinical practice guidelines (Garber et al., 2012; PMID: 23246686), cold intolerance is among the hallmark symptoms used to screen for hypothyroidism.
Which blood test detects it: Thyroid Stimulating Hormone (TSH) is the primary screening test. A normal TSH typically ranges from 0.4 to 4.0 mIU/L, though optimal ranges are narrower (many endocrinologists prefer 0.5 to 2.5 mIU/L). An elevated TSH with low Free T4 confirms primary hypothyroidism.
What to do: If your TSH is elevated, your doctor may prescribe thyroid hormone replacement. You can also explore natural strategies to support your thyroid function, including ensuring adequate iodine and selenium intake.
2. Iron Deficiency Anemia
Iron deficiency is the most common nutritional deficiency worldwide and one of the leading causes of feeling cold all the time. Iron is essential for producing hemoglobin, the protein in red blood cells that carries oxygen to every tissue in your body. When iron stores run low, your red blood cells become small and pale, delivering less oxygen. Less oxygen means less cellular energy production and less body heat.
A landmark review by Camaschella (2015; PMID: 25974669) in the New England Journal of Medicine detailed how iron deficiency impairs thermoregulation well before full-blown anemia develops. This means your cold hands and feet could be an early warning sign even when your hemoglobin is still technically "normal."
Which blood test detects it: Ferritin is the most sensitive marker of iron stores. A normal ferritin range is roughly 20 to 200 ng/mL for women and 30 to 300 ng/mL for men, though many clinicians consider levels below 30 ng/mL functionally deficient. A complete blood count (CBC) showing low hemoglobin (below 12 g/dL for women, below 13.5 g/dL for men) confirms anemia.
What to do: Work on improving your ferritin levels through iron-rich foods like red meat, spinach, and lentils, or through supplementation under medical guidance. For a deeper dive, read our guide on raising ferritin levels the right way.
3. Raynaud's Disease
Raynaud's disease (or Raynaud's phenomenon) causes the small blood vessels in your fingers and toes to overreact to cold or stress. During an episode, the affected areas turn white or blue and feel painfully cold and numb. When blood flow returns, they may turn red and throb or tingle. The condition affects up to 5 percent of the general population, with higher prevalence in women and people living in colder climates.
Wigley and Flavahan (2016; PMID: 27557303) published a comprehensive review in the New England Journal of Medicine explaining how exaggerated vascular reactivity drives the hallmark color changes and temperature sensitivity.
Which blood test detects it: Raynaud's itself is diagnosed clinically based on symptom patterns and color changes. However, blood tests for antinuclear antibodies (ANA) and an erythrocyte sedimentation rate (ESR) help distinguish primary Raynaud's (benign) from secondary Raynaud's linked to autoimmune conditions like lupus or scleroderma. Normal ANA is negative or low titer; ESR is typically below 20 mm/hr for men and below 30 mm/hr for women.
What to do: Avoiding cold triggers and keeping your extremities warm is the first line of defense. Stress management also helps, as emotional stress can trigger episodes. In severe cases, doctors prescribe calcium channel blockers to relax blood vessels.
4. Poor Circulation and Peripheral Artery Disease
Peripheral artery disease (PAD) occurs when plaque builds up in the arteries that supply blood to your legs, arms, and feet. Reduced blood flow means less warm blood reaches your extremities, leaving your hands and feet cold, pale, or even bluish. PAD is more common in people over 50, smokers, and those with high blood pressure, high cholesterol, or diabetes.
Beyond PAD, general poor circulation from prolonged sitting, tight clothing, or chronic conditions can produce the same cold extremities. The key difference is that PAD also causes leg pain when walking (claudication) and slow-healing wounds.
Which blood test detects it: While PAD is diagnosed primarily through an ankle-brachial index (ABI) test, blood work plays a supporting role. A lipid panel (total cholesterol, LDL, HDL, triglycerides) identifies cardiovascular risk. Normal LDL cholesterol should be below 100 mg/dL for those at risk. Fasting glucose and HbA1c rule out diabetic contributions to vascular damage.
What to do: Quit smoking if applicable, increase walking and leg exercises, and manage cholesterol and blood pressure. Regular movement is one of the best ways to improve oxygen delivery throughout your body.
5. Low Body Weight and Low BMI
Body fat is not just energy storage. It acts as insulation, trapping warmth beneath your skin. When your body mass index (BMI) drops below 18.5, or when you have very low body fat percentage, you lose that thermal buffer. Your body may also downregulate your metabolic rate to conserve energy, producing even less heat.
This is commonly seen in endurance athletes with extremely low body fat, people who are undereating (whether intentionally or due to an eating disorder), and naturally very lean individuals.
Which blood test detects it: BMI itself is calculated from height and weight, not a blood test. However, low body weight often coexists with nutritional deficiencies. A comprehensive metabolic panel (CMP) can reveal low albumin (normal: 3.5 to 5.5 g/dL), suggesting inadequate protein intake. Low prealbumin (below 20 mg/dL) is an even earlier marker. Checking thyroid, iron, and B12 alongside BMI gives the full picture.
What to do: If underweight, work with a dietitian to increase caloric intake gradually with nutrient-dense foods. Strength training helps build muscle mass, which is metabolically active and generates heat at rest.
6. Vitamin B12 Deficiency
Vitamin B12 is critical for producing healthy red blood cells and maintaining nerve function. When B12 levels drop, your body produces abnormally large, ineffective red blood cells (megaloblastic anemia), reducing oxygen delivery to tissues. Nerve damage from B12 deficiency can also impair your ability to sense temperature properly, making you feel cold or causing numbness and tingling in your hands and feet.
B12 deficiency is particularly common in vegans and vegetarians (since B12 is found almost exclusively in animal products), older adults (who absorb B12 less efficiently), and people taking certain medications like metformin or proton pump inhibitors.
Which blood test detects it: Serum vitamin B12 levels are the standard test. Normal range is 200 to 900 pg/mL, though symptoms can appear below 400 pg/mL. Methylmalonic acid (MMA) and homocysteine are more sensitive markers that rise early in deficiency, even when serum B12 looks borderline.
What to do: Learn how to improve your vitamin B12 levels naturally through food sources like meat, fish, eggs, and fortified cereals. Sublingual B12 supplements or injections may be necessary for those with absorption issues. Our guide to raising B12 levels covers diet and supplementation strategies in detail.
7. Diabetes and Peripheral Neuropathy
Chronically elevated blood sugar damages the tiny blood vessels and nerves throughout your body, a complication known as diabetic peripheral neuropathy. This nerve damage often starts in the feet and hands, impairing your ability to sense temperature accurately. You may feel persistently cold in your extremities, experience burning or tingling sensations, or lose sensation entirely.
Even prediabetes with moderately elevated glucose levels can begin causing microvascular damage that affects thermoregulation. This is why catching blood sugar problems early matters so much.
Which blood test detects it: Fasting blood glucose (normal: 70 to 99 mg/dL) provides a snapshot, while HbA1c (normal: below 5.7 percent) shows your average blood sugar control over the past two to three months. An HbA1c between 5.7 and 6.4 percent indicates prediabetes; 6.5 percent or higher confirms diabetes.
What to do: If your glucose levels are elevated, explore how to improve your blood glucose naturally through dietary changes, exercise, and stress management. Tight blood sugar control is the most effective way to prevent or slow neuropathy progression.
8. Dehydration
This one surprises most people. When you are dehydrated, your blood volume decreases. Your body responds by constricting blood vessels in your extremities to maintain blood pressure and keep vital organs supplied. The result is cold hands and feet and an overall sensation of chilliness. Dehydration also impairs your body's ability to regulate core temperature efficiently.
You do not have to be severely dehydrated for this to happen. Even mild dehydration of one to two percent body water loss, common in people who simply forget to drink enough water throughout the day, can trigger vasoconstriction and cold sensitivity.
Which blood test detects it: A basic metabolic panel (BMP) can reveal dehydration through elevated blood urea nitrogen (BUN) with a BUN-to-creatinine ratio above 20:1. Elevated serum sodium (above 145 mEq/L) and increased hematocrit (concentrated blood) are additional indicators. Urine specific gravity above 1.020 on a urinalysis also suggests inadequate hydration.
What to do: The fix is straightforward: drink more water. Aim for at least eight glasses (about two liters) daily, and more if you exercise, live in a warm climate, or drink caffeine. Electrolyte balance matters too. Adding a pinch of salt and eating potassium-rich foods helps your body retain the water you consume.
9. Chronic Stress and Adrenal Fatigue
When your body is under chronic stress, your adrenal glands pump out cortisol continuously. In the short term, cortisol triggers your fight-or-flight response, redirecting blood flow away from your skin and extremities toward your muscles and vital organs. Over weeks and months, this sustained vasoconstriction leaves your hands and feet perpetually cold.
Prolonged cortisol elevation also disrupts thyroid hormone conversion (specifically, the conversion of T4 to active T3), effectively slowing your metabolism and compounding cold sensitivity. This creates a feedback loop where stress makes you cold, feeling cold increases discomfort and stress, and the cycle continues.
Which blood test detects it: A morning serum cortisol test is the standard screening tool. Normal morning cortisol ranges from 6 to 23 mcg/dL (measured between 7 and 9 AM). Levels that are persistently elevated or, in later-stage adrenal fatigue, abnormally low suggest chronic stress-related hormonal disruption. A four-point salivary cortisol test gives a more complete picture of your cortisol rhythm throughout the day.
What to do: Address the stress itself through regular exercise, sleep hygiene, meditation, or therapy. Adaptogenic herbs like ashwagandha and rhodiola have clinical evidence supporting their ability to modulate cortisol. Ensuring adequate magnesium and B-vitamin intake also supports healthy adrenal function.
Other Factors That Influence Cold Sensitivity
Beyond these nine medical causes, several demographic and lifestyle factors affect how easily you feel cold:
Age: Older adults lose heat faster due to thinner skin, slower metabolism, and reduced muscle mass. Babies also struggle with thermoregulation because their systems are still developing.
Sex and hormones: Women tend to feel colder than men, partly due to lower muscle mass and hormonal fluctuations throughout the menstrual cycle. Estrogen can make peripheral blood vessels more sensitive to cold.
Pregnancy: Most pregnant women run warmer due to increased blood volume and metabolic rate. If you feel cold during pregnancy, it could signal anemia or thyroid dysfunction and deserves medical attention.
Medications: Beta-blockers, certain antidepressants, and sedatives can impair circulation or slow metabolism, contributing to cold sensitivity.
The Complete Blood Test Panel for Cold Intolerance
If you are tired of being the coldest person in the room, here is the blood test panel to discuss with your doctor:
CBC (Complete Blood Count): Screens for anemia by measuring red blood cells, hemoglobin (normal: 12 to 17.5 g/dL), and hematocrit.
TSH and Free T4: Evaluates thyroid function. Normal TSH: 0.4 to 4.0 mIU/L.
Ferritin, serum iron, and TIBC: Assesses iron stores and transport. Ferritin below 30 ng/mL suggests functional deficiency.
Vitamin B12 and folate: Identifies megaloblastic anemia risk. B12 normal: 200 to 900 pg/mL.
Fasting glucose and HbA1c: Screens for diabetes and prediabetes. Normal fasting glucose: 70 to 99 mg/dL; normal HbA1c: below 5.7 percent.
Morning cortisol: Evaluates stress-related hormonal disruption. Normal: 6 to 23 mcg/dL (morning draw).
Lipid panel: Assesses cardiovascular and circulation risk factors.
Basic metabolic panel: Checks hydration status through BUN, creatinine, and electrolytes.
These tests cover the vast majority of medical causes behind chronic cold sensitivity. Mito Health offers comprehensive blood test panels that include all of these markers, making it easy to get a complete picture in one visit.
Practical Strategies to Warm Up Naturally
While you work on identifying and treating the underlying cause, these evidence-based habits help your body generate and retain more heat:
Eat enough protein and calories. Your body generates heat during digestion (called the thermic effect of food), and protein has the highest thermic effect of any macronutrient. Eating regular, balanced meals keeps your internal furnace running.
Stay hydrated. As we discussed above, even mild dehydration impairs thermoregulation. Keep a water bottle at your desk and sip throughout the day.
Move your body daily. Exercise boosts circulation immediately and builds muscle mass over time. Muscle is metabolically active tissue that generates heat at rest. Even a 15-minute walk can warm you up for hours afterward.
Dress in layers strategically. Merino wool and moisture-wicking base layers trap heat without bulk. Prioritize covering your head, hands, and feet, which are the areas where heat loss is greatest.
Manage stress actively. Deep breathing exercises, meditation, warm baths, and adequate sleep help keep cortisol in check and blood vessels relaxed.
Add warming spices. Ginger, cayenne, and cinnamon have vasodilatory properties that can improve peripheral blood flow.
Frequently Asked Questions
Why am I cold but do not have a fever?
Feeling cold without a fever is actually the more common presentation for the conditions listed above. A fever indicates your body is actively raising its temperature to fight infection. Cold intolerance without fever typically points to a metabolic, nutritional, or circulatory issue. Your core temperature may be normal or even slightly low, but your body is struggling to distribute heat effectively or generate enough of it. Hypothyroidism, iron deficiency, and dehydration are the most frequent culprits when you feel cold without any sign of infection.
Can anxiety make you feel cold?
Yes, absolutely. Anxiety triggers the same fight-or-flight response as physical danger. Your body releases adrenaline and cortisol, which constrict blood vessels in your skin and extremities to redirect blood to your core and muscles. This vasoconstriction can make your hands, feet, and nose feel ice cold. During a panic attack, some people even experience full-body chills or shivering. If anxiety-related cold sensitivity is frequent, it overlaps significantly with the chronic stress mechanism described in cause number nine above. Addressing the anxiety through therapy, breathing techniques, or medication often resolves the cold sensitivity as well.
What blood tests should I get if I am always cold?
Start with the core panel: a complete blood count (CBC), TSH, ferritin, vitamin B12, fasting glucose, and HbA1c. This combination covers the most common causes including thyroid dysfunction, iron deficiency, B12 deficiency, and diabetes. If those come back normal and you are still symptomatic, ask your doctor about adding morning cortisol, a lipid panel, ANA (to rule out autoimmune causes of Raynaud's), and a basic metabolic panel to check hydration status.
Is it normal to always feel cold?
Some people naturally run a bit cooler than average, and women tend to feel colder than men due to hormonal and body composition differences. However, if cold sensitivity is new, worsening, or accompanied by other symptoms like fatigue, weight changes, numbness, or hair loss, it warrants investigation. Persistent cold intolerance that interferes with your daily comfort is worth discussing with your doctor and testing for with blood work.
Can low vitamin D cause cold sensitivity?
While vitamin D deficiency is not a direct cause of cold intolerance, it frequently coexists with conditions that are. Low vitamin D is associated with fatigue, muscle weakness, and mood changes, all of which can amplify the perception of cold. Some research also suggests vitamin D plays a role in vascular health and immune regulation. If you are investigating cold sensitivity, it is reasonable to include a vitamin D level (25-hydroxyvitamin D; normal: 30 to 100 ng/mL) in your blood panel.
Take Action on Your Cold Sensitivity
Constantly feeling cold is not something you have to accept as "just how you are." In most cases, it is a measurable signal from your body that something specific needs attention, whether that is a thyroid imbalance, depleted iron stores, unmanaged blood sugar, or chronic stress that has gone on too long.
The path forward is straightforward: get the right blood tests, identify the root cause, and address it with targeted interventions. At Mito Health, we make this process simple with comprehensive blood panels that cover thyroid function, iron status, B12, glucose metabolism, and more. You get clear results, actionable insights, and a personalized plan to help you feel warmer and healthier.
References
Garber JR, Cobin RH, Gharib H, et al. Clinical practice guidelines for hypothyroidism in adults: cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association. Thyroid. 2012;22(12):1200-1235. PMID: 23246686
Camaschella C. Iron-deficiency anemia. N Engl J Med. 2015;372(19):1832-1843. PMID: 25974669
Wigley FM, Flavahan NA. Raynaud's phenomenon. N Engl J Med. 2016;375(6):556-565. PMID: 27557303
Harvard Health Publishing. Why do I feel so cold all the time? health.harvard.edu
Pop-Busui R, Boulton AJM, Feldman EL, et al. Diabetic neuropathy: a position statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136-154. PMID: 27999003
Related Reading
Get a deeper look into your health.
Schedule online, results in a week
Clear guidance, follow-up care available
HSA/FSA Eligible
Comments
Get a deeper look into your health.
Schedule online, results in a week
Clear guidance, follow-up care available
HSA/FSA Eligible
Why Am I Always Cold? 8 Possible Causes of Cold Sensitivity & What You Can Do
Feeling cold and freezing all the time may seem normal. But cold sensitivity may be a sign of a health issue.
Written by
Mito Health
Why You Always Feel Cold (and When It's More Than Just a Quirk)
You wear a sweater in July. Your coworkers joke about how you always have a blanket at your desk. Your hands and feet feel like ice even when the room is perfectly comfortable for everyone else. Sound familiar?
If you are constantly feeling cold, you are not imagining it, and it is not just "being a cold person." Persistent cold sensitivity, known medically as cold intolerance, often signals that something measurable is happening inside your body. Your normal core body temperature sits around 98.6 degrees Fahrenheit (37 degrees Celsius), though healthy individuals can range from about 97 to 99 degrees Fahrenheit. When your internal thermostat struggles to maintain that range, or when blood flow to your extremities drops, you feel it as a constant, nagging chill.
The encouraging news? Most causes of cold intolerance show up clearly on routine blood tests. Once you know what is driving your symptoms, you can address the root cause rather than just piling on extra layers.
Below are nine medical causes of chronic cold sensitivity, the specific blood tests that detect each one, and actionable steps you can take today.
9 Medical Causes of Always Feeling Cold
1. Hypothyroidism
Hypothyroidism is the single most common hormonal cause of cold intolerance, and it affects roughly 5 percent of the adult population. Your thyroid gland produces hormones (T3 and T4) that act as the master switch for your metabolism. When production drops, your metabolic rate slows down, and your body generates less heat from food and activity. The result: you feel cold even in a warm room, you gain weight without eating more, and fatigue follows you everywhere.
According to the American Thyroid Association clinical practice guidelines (Garber et al., 2012; PMID: 23246686), cold intolerance is among the hallmark symptoms used to screen for hypothyroidism.
Which blood test detects it: Thyroid Stimulating Hormone (TSH) is the primary screening test. A normal TSH typically ranges from 0.4 to 4.0 mIU/L, though optimal ranges are narrower (many endocrinologists prefer 0.5 to 2.5 mIU/L). An elevated TSH with low Free T4 confirms primary hypothyroidism.
What to do: If your TSH is elevated, your doctor may prescribe thyroid hormone replacement. You can also explore natural strategies to support your thyroid function, including ensuring adequate iodine and selenium intake.
2. Iron Deficiency Anemia
Iron deficiency is the most common nutritional deficiency worldwide and one of the leading causes of feeling cold all the time. Iron is essential for producing hemoglobin, the protein in red blood cells that carries oxygen to every tissue in your body. When iron stores run low, your red blood cells become small and pale, delivering less oxygen. Less oxygen means less cellular energy production and less body heat.
A landmark review by Camaschella (2015; PMID: 25974669) in the New England Journal of Medicine detailed how iron deficiency impairs thermoregulation well before full-blown anemia develops. This means your cold hands and feet could be an early warning sign even when your hemoglobin is still technically "normal."
Which blood test detects it: Ferritin is the most sensitive marker of iron stores. A normal ferritin range is roughly 20 to 200 ng/mL for women and 30 to 300 ng/mL for men, though many clinicians consider levels below 30 ng/mL functionally deficient. A complete blood count (CBC) showing low hemoglobin (below 12 g/dL for women, below 13.5 g/dL for men) confirms anemia.
What to do: Work on improving your ferritin levels through iron-rich foods like red meat, spinach, and lentils, or through supplementation under medical guidance. For a deeper dive, read our guide on raising ferritin levels the right way.
3. Raynaud's Disease
Raynaud's disease (or Raynaud's phenomenon) causes the small blood vessels in your fingers and toes to overreact to cold or stress. During an episode, the affected areas turn white or blue and feel painfully cold and numb. When blood flow returns, they may turn red and throb or tingle. The condition affects up to 5 percent of the general population, with higher prevalence in women and people living in colder climates.
Wigley and Flavahan (2016; PMID: 27557303) published a comprehensive review in the New England Journal of Medicine explaining how exaggerated vascular reactivity drives the hallmark color changes and temperature sensitivity.
Which blood test detects it: Raynaud's itself is diagnosed clinically based on symptom patterns and color changes. However, blood tests for antinuclear antibodies (ANA) and an erythrocyte sedimentation rate (ESR) help distinguish primary Raynaud's (benign) from secondary Raynaud's linked to autoimmune conditions like lupus or scleroderma. Normal ANA is negative or low titer; ESR is typically below 20 mm/hr for men and below 30 mm/hr for women.
What to do: Avoiding cold triggers and keeping your extremities warm is the first line of defense. Stress management also helps, as emotional stress can trigger episodes. In severe cases, doctors prescribe calcium channel blockers to relax blood vessels.
4. Poor Circulation and Peripheral Artery Disease
Peripheral artery disease (PAD) occurs when plaque builds up in the arteries that supply blood to your legs, arms, and feet. Reduced blood flow means less warm blood reaches your extremities, leaving your hands and feet cold, pale, or even bluish. PAD is more common in people over 50, smokers, and those with high blood pressure, high cholesterol, or diabetes.
Beyond PAD, general poor circulation from prolonged sitting, tight clothing, or chronic conditions can produce the same cold extremities. The key difference is that PAD also causes leg pain when walking (claudication) and slow-healing wounds.
Which blood test detects it: While PAD is diagnosed primarily through an ankle-brachial index (ABI) test, blood work plays a supporting role. A lipid panel (total cholesterol, LDL, HDL, triglycerides) identifies cardiovascular risk. Normal LDL cholesterol should be below 100 mg/dL for those at risk. Fasting glucose and HbA1c rule out diabetic contributions to vascular damage.
What to do: Quit smoking if applicable, increase walking and leg exercises, and manage cholesterol and blood pressure. Regular movement is one of the best ways to improve oxygen delivery throughout your body.
5. Low Body Weight and Low BMI
Body fat is not just energy storage. It acts as insulation, trapping warmth beneath your skin. When your body mass index (BMI) drops below 18.5, or when you have very low body fat percentage, you lose that thermal buffer. Your body may also downregulate your metabolic rate to conserve energy, producing even less heat.
This is commonly seen in endurance athletes with extremely low body fat, people who are undereating (whether intentionally or due to an eating disorder), and naturally very lean individuals.
Which blood test detects it: BMI itself is calculated from height and weight, not a blood test. However, low body weight often coexists with nutritional deficiencies. A comprehensive metabolic panel (CMP) can reveal low albumin (normal: 3.5 to 5.5 g/dL), suggesting inadequate protein intake. Low prealbumin (below 20 mg/dL) is an even earlier marker. Checking thyroid, iron, and B12 alongside BMI gives the full picture.
What to do: If underweight, work with a dietitian to increase caloric intake gradually with nutrient-dense foods. Strength training helps build muscle mass, which is metabolically active and generates heat at rest.
6. Vitamin B12 Deficiency
Vitamin B12 is critical for producing healthy red blood cells and maintaining nerve function. When B12 levels drop, your body produces abnormally large, ineffective red blood cells (megaloblastic anemia), reducing oxygen delivery to tissues. Nerve damage from B12 deficiency can also impair your ability to sense temperature properly, making you feel cold or causing numbness and tingling in your hands and feet.
B12 deficiency is particularly common in vegans and vegetarians (since B12 is found almost exclusively in animal products), older adults (who absorb B12 less efficiently), and people taking certain medications like metformin or proton pump inhibitors.
Which blood test detects it: Serum vitamin B12 levels are the standard test. Normal range is 200 to 900 pg/mL, though symptoms can appear below 400 pg/mL. Methylmalonic acid (MMA) and homocysteine are more sensitive markers that rise early in deficiency, even when serum B12 looks borderline.
What to do: Learn how to improve your vitamin B12 levels naturally through food sources like meat, fish, eggs, and fortified cereals. Sublingual B12 supplements or injections may be necessary for those with absorption issues. Our guide to raising B12 levels covers diet and supplementation strategies in detail.
7. Diabetes and Peripheral Neuropathy
Chronically elevated blood sugar damages the tiny blood vessels and nerves throughout your body, a complication known as diabetic peripheral neuropathy. This nerve damage often starts in the feet and hands, impairing your ability to sense temperature accurately. You may feel persistently cold in your extremities, experience burning or tingling sensations, or lose sensation entirely.
Even prediabetes with moderately elevated glucose levels can begin causing microvascular damage that affects thermoregulation. This is why catching blood sugar problems early matters so much.
Which blood test detects it: Fasting blood glucose (normal: 70 to 99 mg/dL) provides a snapshot, while HbA1c (normal: below 5.7 percent) shows your average blood sugar control over the past two to three months. An HbA1c between 5.7 and 6.4 percent indicates prediabetes; 6.5 percent or higher confirms diabetes.
What to do: If your glucose levels are elevated, explore how to improve your blood glucose naturally through dietary changes, exercise, and stress management. Tight blood sugar control is the most effective way to prevent or slow neuropathy progression.
8. Dehydration
This one surprises most people. When you are dehydrated, your blood volume decreases. Your body responds by constricting blood vessels in your extremities to maintain blood pressure and keep vital organs supplied. The result is cold hands and feet and an overall sensation of chilliness. Dehydration also impairs your body's ability to regulate core temperature efficiently.
You do not have to be severely dehydrated for this to happen. Even mild dehydration of one to two percent body water loss, common in people who simply forget to drink enough water throughout the day, can trigger vasoconstriction and cold sensitivity.
Which blood test detects it: A basic metabolic panel (BMP) can reveal dehydration through elevated blood urea nitrogen (BUN) with a BUN-to-creatinine ratio above 20:1. Elevated serum sodium (above 145 mEq/L) and increased hematocrit (concentrated blood) are additional indicators. Urine specific gravity above 1.020 on a urinalysis also suggests inadequate hydration.
What to do: The fix is straightforward: drink more water. Aim for at least eight glasses (about two liters) daily, and more if you exercise, live in a warm climate, or drink caffeine. Electrolyte balance matters too. Adding a pinch of salt and eating potassium-rich foods helps your body retain the water you consume.
9. Chronic Stress and Adrenal Fatigue
When your body is under chronic stress, your adrenal glands pump out cortisol continuously. In the short term, cortisol triggers your fight-or-flight response, redirecting blood flow away from your skin and extremities toward your muscles and vital organs. Over weeks and months, this sustained vasoconstriction leaves your hands and feet perpetually cold.
Prolonged cortisol elevation also disrupts thyroid hormone conversion (specifically, the conversion of T4 to active T3), effectively slowing your metabolism and compounding cold sensitivity. This creates a feedback loop where stress makes you cold, feeling cold increases discomfort and stress, and the cycle continues.
Which blood test detects it: A morning serum cortisol test is the standard screening tool. Normal morning cortisol ranges from 6 to 23 mcg/dL (measured between 7 and 9 AM). Levels that are persistently elevated or, in later-stage adrenal fatigue, abnormally low suggest chronic stress-related hormonal disruption. A four-point salivary cortisol test gives a more complete picture of your cortisol rhythm throughout the day.
What to do: Address the stress itself through regular exercise, sleep hygiene, meditation, or therapy. Adaptogenic herbs like ashwagandha and rhodiola have clinical evidence supporting their ability to modulate cortisol. Ensuring adequate magnesium and B-vitamin intake also supports healthy adrenal function.
Other Factors That Influence Cold Sensitivity
Beyond these nine medical causes, several demographic and lifestyle factors affect how easily you feel cold:
Age: Older adults lose heat faster due to thinner skin, slower metabolism, and reduced muscle mass. Babies also struggle with thermoregulation because their systems are still developing.
Sex and hormones: Women tend to feel colder than men, partly due to lower muscle mass and hormonal fluctuations throughout the menstrual cycle. Estrogen can make peripheral blood vessels more sensitive to cold.
Pregnancy: Most pregnant women run warmer due to increased blood volume and metabolic rate. If you feel cold during pregnancy, it could signal anemia or thyroid dysfunction and deserves medical attention.
Medications: Beta-blockers, certain antidepressants, and sedatives can impair circulation or slow metabolism, contributing to cold sensitivity.
The Complete Blood Test Panel for Cold Intolerance
If you are tired of being the coldest person in the room, here is the blood test panel to discuss with your doctor:
CBC (Complete Blood Count): Screens for anemia by measuring red blood cells, hemoglobin (normal: 12 to 17.5 g/dL), and hematocrit.
TSH and Free T4: Evaluates thyroid function. Normal TSH: 0.4 to 4.0 mIU/L.
Ferritin, serum iron, and TIBC: Assesses iron stores and transport. Ferritin below 30 ng/mL suggests functional deficiency.
Vitamin B12 and folate: Identifies megaloblastic anemia risk. B12 normal: 200 to 900 pg/mL.
Fasting glucose and HbA1c: Screens for diabetes and prediabetes. Normal fasting glucose: 70 to 99 mg/dL; normal HbA1c: below 5.7 percent.
Morning cortisol: Evaluates stress-related hormonal disruption. Normal: 6 to 23 mcg/dL (morning draw).
Lipid panel: Assesses cardiovascular and circulation risk factors.
Basic metabolic panel: Checks hydration status through BUN, creatinine, and electrolytes.
These tests cover the vast majority of medical causes behind chronic cold sensitivity. Mito Health offers comprehensive blood test panels that include all of these markers, making it easy to get a complete picture in one visit.
Practical Strategies to Warm Up Naturally
While you work on identifying and treating the underlying cause, these evidence-based habits help your body generate and retain more heat:
Eat enough protein and calories. Your body generates heat during digestion (called the thermic effect of food), and protein has the highest thermic effect of any macronutrient. Eating regular, balanced meals keeps your internal furnace running.
Stay hydrated. As we discussed above, even mild dehydration impairs thermoregulation. Keep a water bottle at your desk and sip throughout the day.
Move your body daily. Exercise boosts circulation immediately and builds muscle mass over time. Muscle is metabolically active tissue that generates heat at rest. Even a 15-minute walk can warm you up for hours afterward.
Dress in layers strategically. Merino wool and moisture-wicking base layers trap heat without bulk. Prioritize covering your head, hands, and feet, which are the areas where heat loss is greatest.
Manage stress actively. Deep breathing exercises, meditation, warm baths, and adequate sleep help keep cortisol in check and blood vessels relaxed.
Add warming spices. Ginger, cayenne, and cinnamon have vasodilatory properties that can improve peripheral blood flow.
Frequently Asked Questions
Why am I cold but do not have a fever?
Feeling cold without a fever is actually the more common presentation for the conditions listed above. A fever indicates your body is actively raising its temperature to fight infection. Cold intolerance without fever typically points to a metabolic, nutritional, or circulatory issue. Your core temperature may be normal or even slightly low, but your body is struggling to distribute heat effectively or generate enough of it. Hypothyroidism, iron deficiency, and dehydration are the most frequent culprits when you feel cold without any sign of infection.
Can anxiety make you feel cold?
Yes, absolutely. Anxiety triggers the same fight-or-flight response as physical danger. Your body releases adrenaline and cortisol, which constrict blood vessels in your skin and extremities to redirect blood to your core and muscles. This vasoconstriction can make your hands, feet, and nose feel ice cold. During a panic attack, some people even experience full-body chills or shivering. If anxiety-related cold sensitivity is frequent, it overlaps significantly with the chronic stress mechanism described in cause number nine above. Addressing the anxiety through therapy, breathing techniques, or medication often resolves the cold sensitivity as well.
What blood tests should I get if I am always cold?
Start with the core panel: a complete blood count (CBC), TSH, ferritin, vitamin B12, fasting glucose, and HbA1c. This combination covers the most common causes including thyroid dysfunction, iron deficiency, B12 deficiency, and diabetes. If those come back normal and you are still symptomatic, ask your doctor about adding morning cortisol, a lipid panel, ANA (to rule out autoimmune causes of Raynaud's), and a basic metabolic panel to check hydration status.
Is it normal to always feel cold?
Some people naturally run a bit cooler than average, and women tend to feel colder than men due to hormonal and body composition differences. However, if cold sensitivity is new, worsening, or accompanied by other symptoms like fatigue, weight changes, numbness, or hair loss, it warrants investigation. Persistent cold intolerance that interferes with your daily comfort is worth discussing with your doctor and testing for with blood work.
Can low vitamin D cause cold sensitivity?
While vitamin D deficiency is not a direct cause of cold intolerance, it frequently coexists with conditions that are. Low vitamin D is associated with fatigue, muscle weakness, and mood changes, all of which can amplify the perception of cold. Some research also suggests vitamin D plays a role in vascular health and immune regulation. If you are investigating cold sensitivity, it is reasonable to include a vitamin D level (25-hydroxyvitamin D; normal: 30 to 100 ng/mL) in your blood panel.
Take Action on Your Cold Sensitivity
Constantly feeling cold is not something you have to accept as "just how you are." In most cases, it is a measurable signal from your body that something specific needs attention, whether that is a thyroid imbalance, depleted iron stores, unmanaged blood sugar, or chronic stress that has gone on too long.
The path forward is straightforward: get the right blood tests, identify the root cause, and address it with targeted interventions. At Mito Health, we make this process simple with comprehensive blood panels that cover thyroid function, iron status, B12, glucose metabolism, and more. You get clear results, actionable insights, and a personalized plan to help you feel warmer and healthier.
References
Garber JR, Cobin RH, Gharib H, et al. Clinical practice guidelines for hypothyroidism in adults: cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association. Thyroid. 2012;22(12):1200-1235. PMID: 23246686
Camaschella C. Iron-deficiency anemia. N Engl J Med. 2015;372(19):1832-1843. PMID: 25974669
Wigley FM, Flavahan NA. Raynaud's phenomenon. N Engl J Med. 2016;375(6):556-565. PMID: 27557303
Harvard Health Publishing. Why do I feel so cold all the time? health.harvard.edu
Pop-Busui R, Boulton AJM, Feldman EL, et al. Diabetic neuropathy: a position statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136-154. PMID: 27999003
Related Reading
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Why Am I Always Cold? 8 Possible Causes of Cold Sensitivity & What You Can Do
Feeling cold and freezing all the time may seem normal. But cold sensitivity may be a sign of a health issue.
Written by
Mito Health
Why You Always Feel Cold (and When It's More Than Just a Quirk)
You wear a sweater in July. Your coworkers joke about how you always have a blanket at your desk. Your hands and feet feel like ice even when the room is perfectly comfortable for everyone else. Sound familiar?
If you are constantly feeling cold, you are not imagining it, and it is not just "being a cold person." Persistent cold sensitivity, known medically as cold intolerance, often signals that something measurable is happening inside your body. Your normal core body temperature sits around 98.6 degrees Fahrenheit (37 degrees Celsius), though healthy individuals can range from about 97 to 99 degrees Fahrenheit. When your internal thermostat struggles to maintain that range, or when blood flow to your extremities drops, you feel it as a constant, nagging chill.
The encouraging news? Most causes of cold intolerance show up clearly on routine blood tests. Once you know what is driving your symptoms, you can address the root cause rather than just piling on extra layers.
Below are nine medical causes of chronic cold sensitivity, the specific blood tests that detect each one, and actionable steps you can take today.
9 Medical Causes of Always Feeling Cold
1. Hypothyroidism
Hypothyroidism is the single most common hormonal cause of cold intolerance, and it affects roughly 5 percent of the adult population. Your thyroid gland produces hormones (T3 and T4) that act as the master switch for your metabolism. When production drops, your metabolic rate slows down, and your body generates less heat from food and activity. The result: you feel cold even in a warm room, you gain weight without eating more, and fatigue follows you everywhere.
According to the American Thyroid Association clinical practice guidelines (Garber et al., 2012; PMID: 23246686), cold intolerance is among the hallmark symptoms used to screen for hypothyroidism.
Which blood test detects it: Thyroid Stimulating Hormone (TSH) is the primary screening test. A normal TSH typically ranges from 0.4 to 4.0 mIU/L, though optimal ranges are narrower (many endocrinologists prefer 0.5 to 2.5 mIU/L). An elevated TSH with low Free T4 confirms primary hypothyroidism.
What to do: If your TSH is elevated, your doctor may prescribe thyroid hormone replacement. You can also explore natural strategies to support your thyroid function, including ensuring adequate iodine and selenium intake.
2. Iron Deficiency Anemia
Iron deficiency is the most common nutritional deficiency worldwide and one of the leading causes of feeling cold all the time. Iron is essential for producing hemoglobin, the protein in red blood cells that carries oxygen to every tissue in your body. When iron stores run low, your red blood cells become small and pale, delivering less oxygen. Less oxygen means less cellular energy production and less body heat.
A landmark review by Camaschella (2015; PMID: 25974669) in the New England Journal of Medicine detailed how iron deficiency impairs thermoregulation well before full-blown anemia develops. This means your cold hands and feet could be an early warning sign even when your hemoglobin is still technically "normal."
Which blood test detects it: Ferritin is the most sensitive marker of iron stores. A normal ferritin range is roughly 20 to 200 ng/mL for women and 30 to 300 ng/mL for men, though many clinicians consider levels below 30 ng/mL functionally deficient. A complete blood count (CBC) showing low hemoglobin (below 12 g/dL for women, below 13.5 g/dL for men) confirms anemia.
What to do: Work on improving your ferritin levels through iron-rich foods like red meat, spinach, and lentils, or through supplementation under medical guidance. For a deeper dive, read our guide on raising ferritin levels the right way.
3. Raynaud's Disease
Raynaud's disease (or Raynaud's phenomenon) causes the small blood vessels in your fingers and toes to overreact to cold or stress. During an episode, the affected areas turn white or blue and feel painfully cold and numb. When blood flow returns, they may turn red and throb or tingle. The condition affects up to 5 percent of the general population, with higher prevalence in women and people living in colder climates.
Wigley and Flavahan (2016; PMID: 27557303) published a comprehensive review in the New England Journal of Medicine explaining how exaggerated vascular reactivity drives the hallmark color changes and temperature sensitivity.
Which blood test detects it: Raynaud's itself is diagnosed clinically based on symptom patterns and color changes. However, blood tests for antinuclear antibodies (ANA) and an erythrocyte sedimentation rate (ESR) help distinguish primary Raynaud's (benign) from secondary Raynaud's linked to autoimmune conditions like lupus or scleroderma. Normal ANA is negative or low titer; ESR is typically below 20 mm/hr for men and below 30 mm/hr for women.
What to do: Avoiding cold triggers and keeping your extremities warm is the first line of defense. Stress management also helps, as emotional stress can trigger episodes. In severe cases, doctors prescribe calcium channel blockers to relax blood vessels.
4. Poor Circulation and Peripheral Artery Disease
Peripheral artery disease (PAD) occurs when plaque builds up in the arteries that supply blood to your legs, arms, and feet. Reduced blood flow means less warm blood reaches your extremities, leaving your hands and feet cold, pale, or even bluish. PAD is more common in people over 50, smokers, and those with high blood pressure, high cholesterol, or diabetes.
Beyond PAD, general poor circulation from prolonged sitting, tight clothing, or chronic conditions can produce the same cold extremities. The key difference is that PAD also causes leg pain when walking (claudication) and slow-healing wounds.
Which blood test detects it: While PAD is diagnosed primarily through an ankle-brachial index (ABI) test, blood work plays a supporting role. A lipid panel (total cholesterol, LDL, HDL, triglycerides) identifies cardiovascular risk. Normal LDL cholesterol should be below 100 mg/dL for those at risk. Fasting glucose and HbA1c rule out diabetic contributions to vascular damage.
What to do: Quit smoking if applicable, increase walking and leg exercises, and manage cholesterol and blood pressure. Regular movement is one of the best ways to improve oxygen delivery throughout your body.
5. Low Body Weight and Low BMI
Body fat is not just energy storage. It acts as insulation, trapping warmth beneath your skin. When your body mass index (BMI) drops below 18.5, or when you have very low body fat percentage, you lose that thermal buffer. Your body may also downregulate your metabolic rate to conserve energy, producing even less heat.
This is commonly seen in endurance athletes with extremely low body fat, people who are undereating (whether intentionally or due to an eating disorder), and naturally very lean individuals.
Which blood test detects it: BMI itself is calculated from height and weight, not a blood test. However, low body weight often coexists with nutritional deficiencies. A comprehensive metabolic panel (CMP) can reveal low albumin (normal: 3.5 to 5.5 g/dL), suggesting inadequate protein intake. Low prealbumin (below 20 mg/dL) is an even earlier marker. Checking thyroid, iron, and B12 alongside BMI gives the full picture.
What to do: If underweight, work with a dietitian to increase caloric intake gradually with nutrient-dense foods. Strength training helps build muscle mass, which is metabolically active and generates heat at rest.
6. Vitamin B12 Deficiency
Vitamin B12 is critical for producing healthy red blood cells and maintaining nerve function. When B12 levels drop, your body produces abnormally large, ineffective red blood cells (megaloblastic anemia), reducing oxygen delivery to tissues. Nerve damage from B12 deficiency can also impair your ability to sense temperature properly, making you feel cold or causing numbness and tingling in your hands and feet.
B12 deficiency is particularly common in vegans and vegetarians (since B12 is found almost exclusively in animal products), older adults (who absorb B12 less efficiently), and people taking certain medications like metformin or proton pump inhibitors.
Which blood test detects it: Serum vitamin B12 levels are the standard test. Normal range is 200 to 900 pg/mL, though symptoms can appear below 400 pg/mL. Methylmalonic acid (MMA) and homocysteine are more sensitive markers that rise early in deficiency, even when serum B12 looks borderline.
What to do: Learn how to improve your vitamin B12 levels naturally through food sources like meat, fish, eggs, and fortified cereals. Sublingual B12 supplements or injections may be necessary for those with absorption issues. Our guide to raising B12 levels covers diet and supplementation strategies in detail.
7. Diabetes and Peripheral Neuropathy
Chronically elevated blood sugar damages the tiny blood vessels and nerves throughout your body, a complication known as diabetic peripheral neuropathy. This nerve damage often starts in the feet and hands, impairing your ability to sense temperature accurately. You may feel persistently cold in your extremities, experience burning or tingling sensations, or lose sensation entirely.
Even prediabetes with moderately elevated glucose levels can begin causing microvascular damage that affects thermoregulation. This is why catching blood sugar problems early matters so much.
Which blood test detects it: Fasting blood glucose (normal: 70 to 99 mg/dL) provides a snapshot, while HbA1c (normal: below 5.7 percent) shows your average blood sugar control over the past two to three months. An HbA1c between 5.7 and 6.4 percent indicates prediabetes; 6.5 percent or higher confirms diabetes.
What to do: If your glucose levels are elevated, explore how to improve your blood glucose naturally through dietary changes, exercise, and stress management. Tight blood sugar control is the most effective way to prevent or slow neuropathy progression.
8. Dehydration
This one surprises most people. When you are dehydrated, your blood volume decreases. Your body responds by constricting blood vessels in your extremities to maintain blood pressure and keep vital organs supplied. The result is cold hands and feet and an overall sensation of chilliness. Dehydration also impairs your body's ability to regulate core temperature efficiently.
You do not have to be severely dehydrated for this to happen. Even mild dehydration of one to two percent body water loss, common in people who simply forget to drink enough water throughout the day, can trigger vasoconstriction and cold sensitivity.
Which blood test detects it: A basic metabolic panel (BMP) can reveal dehydration through elevated blood urea nitrogen (BUN) with a BUN-to-creatinine ratio above 20:1. Elevated serum sodium (above 145 mEq/L) and increased hematocrit (concentrated blood) are additional indicators. Urine specific gravity above 1.020 on a urinalysis also suggests inadequate hydration.
What to do: The fix is straightforward: drink more water. Aim for at least eight glasses (about two liters) daily, and more if you exercise, live in a warm climate, or drink caffeine. Electrolyte balance matters too. Adding a pinch of salt and eating potassium-rich foods helps your body retain the water you consume.
9. Chronic Stress and Adrenal Fatigue
When your body is under chronic stress, your adrenal glands pump out cortisol continuously. In the short term, cortisol triggers your fight-or-flight response, redirecting blood flow away from your skin and extremities toward your muscles and vital organs. Over weeks and months, this sustained vasoconstriction leaves your hands and feet perpetually cold.
Prolonged cortisol elevation also disrupts thyroid hormone conversion (specifically, the conversion of T4 to active T3), effectively slowing your metabolism and compounding cold sensitivity. This creates a feedback loop where stress makes you cold, feeling cold increases discomfort and stress, and the cycle continues.
Which blood test detects it: A morning serum cortisol test is the standard screening tool. Normal morning cortisol ranges from 6 to 23 mcg/dL (measured between 7 and 9 AM). Levels that are persistently elevated or, in later-stage adrenal fatigue, abnormally low suggest chronic stress-related hormonal disruption. A four-point salivary cortisol test gives a more complete picture of your cortisol rhythm throughout the day.
What to do: Address the stress itself through regular exercise, sleep hygiene, meditation, or therapy. Adaptogenic herbs like ashwagandha and rhodiola have clinical evidence supporting their ability to modulate cortisol. Ensuring adequate magnesium and B-vitamin intake also supports healthy adrenal function.
Other Factors That Influence Cold Sensitivity
Beyond these nine medical causes, several demographic and lifestyle factors affect how easily you feel cold:
Age: Older adults lose heat faster due to thinner skin, slower metabolism, and reduced muscle mass. Babies also struggle with thermoregulation because their systems are still developing.
Sex and hormones: Women tend to feel colder than men, partly due to lower muscle mass and hormonal fluctuations throughout the menstrual cycle. Estrogen can make peripheral blood vessels more sensitive to cold.
Pregnancy: Most pregnant women run warmer due to increased blood volume and metabolic rate. If you feel cold during pregnancy, it could signal anemia or thyroid dysfunction and deserves medical attention.
Medications: Beta-blockers, certain antidepressants, and sedatives can impair circulation or slow metabolism, contributing to cold sensitivity.
The Complete Blood Test Panel for Cold Intolerance
If you are tired of being the coldest person in the room, here is the blood test panel to discuss with your doctor:
CBC (Complete Blood Count): Screens for anemia by measuring red blood cells, hemoglobin (normal: 12 to 17.5 g/dL), and hematocrit.
TSH and Free T4: Evaluates thyroid function. Normal TSH: 0.4 to 4.0 mIU/L.
Ferritin, serum iron, and TIBC: Assesses iron stores and transport. Ferritin below 30 ng/mL suggests functional deficiency.
Vitamin B12 and folate: Identifies megaloblastic anemia risk. B12 normal: 200 to 900 pg/mL.
Fasting glucose and HbA1c: Screens for diabetes and prediabetes. Normal fasting glucose: 70 to 99 mg/dL; normal HbA1c: below 5.7 percent.
Morning cortisol: Evaluates stress-related hormonal disruption. Normal: 6 to 23 mcg/dL (morning draw).
Lipid panel: Assesses cardiovascular and circulation risk factors.
Basic metabolic panel: Checks hydration status through BUN, creatinine, and electrolytes.
These tests cover the vast majority of medical causes behind chronic cold sensitivity. Mito Health offers comprehensive blood test panels that include all of these markers, making it easy to get a complete picture in one visit.
Practical Strategies to Warm Up Naturally
While you work on identifying and treating the underlying cause, these evidence-based habits help your body generate and retain more heat:
Eat enough protein and calories. Your body generates heat during digestion (called the thermic effect of food), and protein has the highest thermic effect of any macronutrient. Eating regular, balanced meals keeps your internal furnace running.
Stay hydrated. As we discussed above, even mild dehydration impairs thermoregulation. Keep a water bottle at your desk and sip throughout the day.
Move your body daily. Exercise boosts circulation immediately and builds muscle mass over time. Muscle is metabolically active tissue that generates heat at rest. Even a 15-minute walk can warm you up for hours afterward.
Dress in layers strategically. Merino wool and moisture-wicking base layers trap heat without bulk. Prioritize covering your head, hands, and feet, which are the areas where heat loss is greatest.
Manage stress actively. Deep breathing exercises, meditation, warm baths, and adequate sleep help keep cortisol in check and blood vessels relaxed.
Add warming spices. Ginger, cayenne, and cinnamon have vasodilatory properties that can improve peripheral blood flow.
Frequently Asked Questions
Why am I cold but do not have a fever?
Feeling cold without a fever is actually the more common presentation for the conditions listed above. A fever indicates your body is actively raising its temperature to fight infection. Cold intolerance without fever typically points to a metabolic, nutritional, or circulatory issue. Your core temperature may be normal or even slightly low, but your body is struggling to distribute heat effectively or generate enough of it. Hypothyroidism, iron deficiency, and dehydration are the most frequent culprits when you feel cold without any sign of infection.
Can anxiety make you feel cold?
Yes, absolutely. Anxiety triggers the same fight-or-flight response as physical danger. Your body releases adrenaline and cortisol, which constrict blood vessels in your skin and extremities to redirect blood to your core and muscles. This vasoconstriction can make your hands, feet, and nose feel ice cold. During a panic attack, some people even experience full-body chills or shivering. If anxiety-related cold sensitivity is frequent, it overlaps significantly with the chronic stress mechanism described in cause number nine above. Addressing the anxiety through therapy, breathing techniques, or medication often resolves the cold sensitivity as well.
What blood tests should I get if I am always cold?
Start with the core panel: a complete blood count (CBC), TSH, ferritin, vitamin B12, fasting glucose, and HbA1c. This combination covers the most common causes including thyroid dysfunction, iron deficiency, B12 deficiency, and diabetes. If those come back normal and you are still symptomatic, ask your doctor about adding morning cortisol, a lipid panel, ANA (to rule out autoimmune causes of Raynaud's), and a basic metabolic panel to check hydration status.
Is it normal to always feel cold?
Some people naturally run a bit cooler than average, and women tend to feel colder than men due to hormonal and body composition differences. However, if cold sensitivity is new, worsening, or accompanied by other symptoms like fatigue, weight changes, numbness, or hair loss, it warrants investigation. Persistent cold intolerance that interferes with your daily comfort is worth discussing with your doctor and testing for with blood work.
Can low vitamin D cause cold sensitivity?
While vitamin D deficiency is not a direct cause of cold intolerance, it frequently coexists with conditions that are. Low vitamin D is associated with fatigue, muscle weakness, and mood changes, all of which can amplify the perception of cold. Some research also suggests vitamin D plays a role in vascular health and immune regulation. If you are investigating cold sensitivity, it is reasonable to include a vitamin D level (25-hydroxyvitamin D; normal: 30 to 100 ng/mL) in your blood panel.
Take Action on Your Cold Sensitivity
Constantly feeling cold is not something you have to accept as "just how you are." In most cases, it is a measurable signal from your body that something specific needs attention, whether that is a thyroid imbalance, depleted iron stores, unmanaged blood sugar, or chronic stress that has gone on too long.
The path forward is straightforward: get the right blood tests, identify the root cause, and address it with targeted interventions. At Mito Health, we make this process simple with comprehensive blood panels that cover thyroid function, iron status, B12, glucose metabolism, and more. You get clear results, actionable insights, and a personalized plan to help you feel warmer and healthier.
References
Garber JR, Cobin RH, Gharib H, et al. Clinical practice guidelines for hypothyroidism in adults: cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association. Thyroid. 2012;22(12):1200-1235. PMID: 23246686
Camaschella C. Iron-deficiency anemia. N Engl J Med. 2015;372(19):1832-1843. PMID: 25974669
Wigley FM, Flavahan NA. Raynaud's phenomenon. N Engl J Med. 2016;375(6):556-565. PMID: 27557303
Harvard Health Publishing. Why do I feel so cold all the time? health.harvard.edu
Pop-Busui R, Boulton AJM, Feldman EL, et al. Diabetic neuropathy: a position statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136-154. PMID: 27999003
Related Reading
Get a deeper look into your health.
Schedule online, results in a week
Clear guidance, follow-up care available
HSA/FSA Eligible
Comments
Why Am I Always Cold? 8 Possible Causes of Cold Sensitivity & What You Can Do
Feeling cold and freezing all the time may seem normal. But cold sensitivity may be a sign of a health issue.
Written by
Mito Health
Why You Always Feel Cold (and When It's More Than Just a Quirk)
You wear a sweater in July. Your coworkers joke about how you always have a blanket at your desk. Your hands and feet feel like ice even when the room is perfectly comfortable for everyone else. Sound familiar?
If you are constantly feeling cold, you are not imagining it, and it is not just "being a cold person." Persistent cold sensitivity, known medically as cold intolerance, often signals that something measurable is happening inside your body. Your normal core body temperature sits around 98.6 degrees Fahrenheit (37 degrees Celsius), though healthy individuals can range from about 97 to 99 degrees Fahrenheit. When your internal thermostat struggles to maintain that range, or when blood flow to your extremities drops, you feel it as a constant, nagging chill.
The encouraging news? Most causes of cold intolerance show up clearly on routine blood tests. Once you know what is driving your symptoms, you can address the root cause rather than just piling on extra layers.
Below are nine medical causes of chronic cold sensitivity, the specific blood tests that detect each one, and actionable steps you can take today.
9 Medical Causes of Always Feeling Cold
1. Hypothyroidism
Hypothyroidism is the single most common hormonal cause of cold intolerance, and it affects roughly 5 percent of the adult population. Your thyroid gland produces hormones (T3 and T4) that act as the master switch for your metabolism. When production drops, your metabolic rate slows down, and your body generates less heat from food and activity. The result: you feel cold even in a warm room, you gain weight without eating more, and fatigue follows you everywhere.
According to the American Thyroid Association clinical practice guidelines (Garber et al., 2012; PMID: 23246686), cold intolerance is among the hallmark symptoms used to screen for hypothyroidism.
Which blood test detects it: Thyroid Stimulating Hormone (TSH) is the primary screening test. A normal TSH typically ranges from 0.4 to 4.0 mIU/L, though optimal ranges are narrower (many endocrinologists prefer 0.5 to 2.5 mIU/L). An elevated TSH with low Free T4 confirms primary hypothyroidism.
What to do: If your TSH is elevated, your doctor may prescribe thyroid hormone replacement. You can also explore natural strategies to support your thyroid function, including ensuring adequate iodine and selenium intake.
2. Iron Deficiency Anemia
Iron deficiency is the most common nutritional deficiency worldwide and one of the leading causes of feeling cold all the time. Iron is essential for producing hemoglobin, the protein in red blood cells that carries oxygen to every tissue in your body. When iron stores run low, your red blood cells become small and pale, delivering less oxygen. Less oxygen means less cellular energy production and less body heat.
A landmark review by Camaschella (2015; PMID: 25974669) in the New England Journal of Medicine detailed how iron deficiency impairs thermoregulation well before full-blown anemia develops. This means your cold hands and feet could be an early warning sign even when your hemoglobin is still technically "normal."
Which blood test detects it: Ferritin is the most sensitive marker of iron stores. A normal ferritin range is roughly 20 to 200 ng/mL for women and 30 to 300 ng/mL for men, though many clinicians consider levels below 30 ng/mL functionally deficient. A complete blood count (CBC) showing low hemoglobin (below 12 g/dL for women, below 13.5 g/dL for men) confirms anemia.
What to do: Work on improving your ferritin levels through iron-rich foods like red meat, spinach, and lentils, or through supplementation under medical guidance. For a deeper dive, read our guide on raising ferritin levels the right way.
3. Raynaud's Disease
Raynaud's disease (or Raynaud's phenomenon) causes the small blood vessels in your fingers and toes to overreact to cold or stress. During an episode, the affected areas turn white or blue and feel painfully cold and numb. When blood flow returns, they may turn red and throb or tingle. The condition affects up to 5 percent of the general population, with higher prevalence in women and people living in colder climates.
Wigley and Flavahan (2016; PMID: 27557303) published a comprehensive review in the New England Journal of Medicine explaining how exaggerated vascular reactivity drives the hallmark color changes and temperature sensitivity.
Which blood test detects it: Raynaud's itself is diagnosed clinically based on symptom patterns and color changes. However, blood tests for antinuclear antibodies (ANA) and an erythrocyte sedimentation rate (ESR) help distinguish primary Raynaud's (benign) from secondary Raynaud's linked to autoimmune conditions like lupus or scleroderma. Normal ANA is negative or low titer; ESR is typically below 20 mm/hr for men and below 30 mm/hr for women.
What to do: Avoiding cold triggers and keeping your extremities warm is the first line of defense. Stress management also helps, as emotional stress can trigger episodes. In severe cases, doctors prescribe calcium channel blockers to relax blood vessels.
4. Poor Circulation and Peripheral Artery Disease
Peripheral artery disease (PAD) occurs when plaque builds up in the arteries that supply blood to your legs, arms, and feet. Reduced blood flow means less warm blood reaches your extremities, leaving your hands and feet cold, pale, or even bluish. PAD is more common in people over 50, smokers, and those with high blood pressure, high cholesterol, or diabetes.
Beyond PAD, general poor circulation from prolonged sitting, tight clothing, or chronic conditions can produce the same cold extremities. The key difference is that PAD also causes leg pain when walking (claudication) and slow-healing wounds.
Which blood test detects it: While PAD is diagnosed primarily through an ankle-brachial index (ABI) test, blood work plays a supporting role. A lipid panel (total cholesterol, LDL, HDL, triglycerides) identifies cardiovascular risk. Normal LDL cholesterol should be below 100 mg/dL for those at risk. Fasting glucose and HbA1c rule out diabetic contributions to vascular damage.
What to do: Quit smoking if applicable, increase walking and leg exercises, and manage cholesterol and blood pressure. Regular movement is one of the best ways to improve oxygen delivery throughout your body.
5. Low Body Weight and Low BMI
Body fat is not just energy storage. It acts as insulation, trapping warmth beneath your skin. When your body mass index (BMI) drops below 18.5, or when you have very low body fat percentage, you lose that thermal buffer. Your body may also downregulate your metabolic rate to conserve energy, producing even less heat.
This is commonly seen in endurance athletes with extremely low body fat, people who are undereating (whether intentionally or due to an eating disorder), and naturally very lean individuals.
Which blood test detects it: BMI itself is calculated from height and weight, not a blood test. However, low body weight often coexists with nutritional deficiencies. A comprehensive metabolic panel (CMP) can reveal low albumin (normal: 3.5 to 5.5 g/dL), suggesting inadequate protein intake. Low prealbumin (below 20 mg/dL) is an even earlier marker. Checking thyroid, iron, and B12 alongside BMI gives the full picture.
What to do: If underweight, work with a dietitian to increase caloric intake gradually with nutrient-dense foods. Strength training helps build muscle mass, which is metabolically active and generates heat at rest.
6. Vitamin B12 Deficiency
Vitamin B12 is critical for producing healthy red blood cells and maintaining nerve function. When B12 levels drop, your body produces abnormally large, ineffective red blood cells (megaloblastic anemia), reducing oxygen delivery to tissues. Nerve damage from B12 deficiency can also impair your ability to sense temperature properly, making you feel cold or causing numbness and tingling in your hands and feet.
B12 deficiency is particularly common in vegans and vegetarians (since B12 is found almost exclusively in animal products), older adults (who absorb B12 less efficiently), and people taking certain medications like metformin or proton pump inhibitors.
Which blood test detects it: Serum vitamin B12 levels are the standard test. Normal range is 200 to 900 pg/mL, though symptoms can appear below 400 pg/mL. Methylmalonic acid (MMA) and homocysteine are more sensitive markers that rise early in deficiency, even when serum B12 looks borderline.
What to do: Learn how to improve your vitamin B12 levels naturally through food sources like meat, fish, eggs, and fortified cereals. Sublingual B12 supplements or injections may be necessary for those with absorption issues. Our guide to raising B12 levels covers diet and supplementation strategies in detail.
7. Diabetes and Peripheral Neuropathy
Chronically elevated blood sugar damages the tiny blood vessels and nerves throughout your body, a complication known as diabetic peripheral neuropathy. This nerve damage often starts in the feet and hands, impairing your ability to sense temperature accurately. You may feel persistently cold in your extremities, experience burning or tingling sensations, or lose sensation entirely.
Even prediabetes with moderately elevated glucose levels can begin causing microvascular damage that affects thermoregulation. This is why catching blood sugar problems early matters so much.
Which blood test detects it: Fasting blood glucose (normal: 70 to 99 mg/dL) provides a snapshot, while HbA1c (normal: below 5.7 percent) shows your average blood sugar control over the past two to three months. An HbA1c between 5.7 and 6.4 percent indicates prediabetes; 6.5 percent or higher confirms diabetes.
What to do: If your glucose levels are elevated, explore how to improve your blood glucose naturally through dietary changes, exercise, and stress management. Tight blood sugar control is the most effective way to prevent or slow neuropathy progression.
8. Dehydration
This one surprises most people. When you are dehydrated, your blood volume decreases. Your body responds by constricting blood vessels in your extremities to maintain blood pressure and keep vital organs supplied. The result is cold hands and feet and an overall sensation of chilliness. Dehydration also impairs your body's ability to regulate core temperature efficiently.
You do not have to be severely dehydrated for this to happen. Even mild dehydration of one to two percent body water loss, common in people who simply forget to drink enough water throughout the day, can trigger vasoconstriction and cold sensitivity.
Which blood test detects it: A basic metabolic panel (BMP) can reveal dehydration through elevated blood urea nitrogen (BUN) with a BUN-to-creatinine ratio above 20:1. Elevated serum sodium (above 145 mEq/L) and increased hematocrit (concentrated blood) are additional indicators. Urine specific gravity above 1.020 on a urinalysis also suggests inadequate hydration.
What to do: The fix is straightforward: drink more water. Aim for at least eight glasses (about two liters) daily, and more if you exercise, live in a warm climate, or drink caffeine. Electrolyte balance matters too. Adding a pinch of salt and eating potassium-rich foods helps your body retain the water you consume.
9. Chronic Stress and Adrenal Fatigue
When your body is under chronic stress, your adrenal glands pump out cortisol continuously. In the short term, cortisol triggers your fight-or-flight response, redirecting blood flow away from your skin and extremities toward your muscles and vital organs. Over weeks and months, this sustained vasoconstriction leaves your hands and feet perpetually cold.
Prolonged cortisol elevation also disrupts thyroid hormone conversion (specifically, the conversion of T4 to active T3), effectively slowing your metabolism and compounding cold sensitivity. This creates a feedback loop where stress makes you cold, feeling cold increases discomfort and stress, and the cycle continues.
Which blood test detects it: A morning serum cortisol test is the standard screening tool. Normal morning cortisol ranges from 6 to 23 mcg/dL (measured between 7 and 9 AM). Levels that are persistently elevated or, in later-stage adrenal fatigue, abnormally low suggest chronic stress-related hormonal disruption. A four-point salivary cortisol test gives a more complete picture of your cortisol rhythm throughout the day.
What to do: Address the stress itself through regular exercise, sleep hygiene, meditation, or therapy. Adaptogenic herbs like ashwagandha and rhodiola have clinical evidence supporting their ability to modulate cortisol. Ensuring adequate magnesium and B-vitamin intake also supports healthy adrenal function.
Other Factors That Influence Cold Sensitivity
Beyond these nine medical causes, several demographic and lifestyle factors affect how easily you feel cold:
Age: Older adults lose heat faster due to thinner skin, slower metabolism, and reduced muscle mass. Babies also struggle with thermoregulation because their systems are still developing.
Sex and hormones: Women tend to feel colder than men, partly due to lower muscle mass and hormonal fluctuations throughout the menstrual cycle. Estrogen can make peripheral blood vessels more sensitive to cold.
Pregnancy: Most pregnant women run warmer due to increased blood volume and metabolic rate. If you feel cold during pregnancy, it could signal anemia or thyroid dysfunction and deserves medical attention.
Medications: Beta-blockers, certain antidepressants, and sedatives can impair circulation or slow metabolism, contributing to cold sensitivity.
The Complete Blood Test Panel for Cold Intolerance
If you are tired of being the coldest person in the room, here is the blood test panel to discuss with your doctor:
CBC (Complete Blood Count): Screens for anemia by measuring red blood cells, hemoglobin (normal: 12 to 17.5 g/dL), and hematocrit.
TSH and Free T4: Evaluates thyroid function. Normal TSH: 0.4 to 4.0 mIU/L.
Ferritin, serum iron, and TIBC: Assesses iron stores and transport. Ferritin below 30 ng/mL suggests functional deficiency.
Vitamin B12 and folate: Identifies megaloblastic anemia risk. B12 normal: 200 to 900 pg/mL.
Fasting glucose and HbA1c: Screens for diabetes and prediabetes. Normal fasting glucose: 70 to 99 mg/dL; normal HbA1c: below 5.7 percent.
Morning cortisol: Evaluates stress-related hormonal disruption. Normal: 6 to 23 mcg/dL (morning draw).
Lipid panel: Assesses cardiovascular and circulation risk factors.
Basic metabolic panel: Checks hydration status through BUN, creatinine, and electrolytes.
These tests cover the vast majority of medical causes behind chronic cold sensitivity. Mito Health offers comprehensive blood test panels that include all of these markers, making it easy to get a complete picture in one visit.
Practical Strategies to Warm Up Naturally
While you work on identifying and treating the underlying cause, these evidence-based habits help your body generate and retain more heat:
Eat enough protein and calories. Your body generates heat during digestion (called the thermic effect of food), and protein has the highest thermic effect of any macronutrient. Eating regular, balanced meals keeps your internal furnace running.
Stay hydrated. As we discussed above, even mild dehydration impairs thermoregulation. Keep a water bottle at your desk and sip throughout the day.
Move your body daily. Exercise boosts circulation immediately and builds muscle mass over time. Muscle is metabolically active tissue that generates heat at rest. Even a 15-minute walk can warm you up for hours afterward.
Dress in layers strategically. Merino wool and moisture-wicking base layers trap heat without bulk. Prioritize covering your head, hands, and feet, which are the areas where heat loss is greatest.
Manage stress actively. Deep breathing exercises, meditation, warm baths, and adequate sleep help keep cortisol in check and blood vessels relaxed.
Add warming spices. Ginger, cayenne, and cinnamon have vasodilatory properties that can improve peripheral blood flow.
Frequently Asked Questions
Why am I cold but do not have a fever?
Feeling cold without a fever is actually the more common presentation for the conditions listed above. A fever indicates your body is actively raising its temperature to fight infection. Cold intolerance without fever typically points to a metabolic, nutritional, or circulatory issue. Your core temperature may be normal or even slightly low, but your body is struggling to distribute heat effectively or generate enough of it. Hypothyroidism, iron deficiency, and dehydration are the most frequent culprits when you feel cold without any sign of infection.
Can anxiety make you feel cold?
Yes, absolutely. Anxiety triggers the same fight-or-flight response as physical danger. Your body releases adrenaline and cortisol, which constrict blood vessels in your skin and extremities to redirect blood to your core and muscles. This vasoconstriction can make your hands, feet, and nose feel ice cold. During a panic attack, some people even experience full-body chills or shivering. If anxiety-related cold sensitivity is frequent, it overlaps significantly with the chronic stress mechanism described in cause number nine above. Addressing the anxiety through therapy, breathing techniques, or medication often resolves the cold sensitivity as well.
What blood tests should I get if I am always cold?
Start with the core panel: a complete blood count (CBC), TSH, ferritin, vitamin B12, fasting glucose, and HbA1c. This combination covers the most common causes including thyroid dysfunction, iron deficiency, B12 deficiency, and diabetes. If those come back normal and you are still symptomatic, ask your doctor about adding morning cortisol, a lipid panel, ANA (to rule out autoimmune causes of Raynaud's), and a basic metabolic panel to check hydration status.
Is it normal to always feel cold?
Some people naturally run a bit cooler than average, and women tend to feel colder than men due to hormonal and body composition differences. However, if cold sensitivity is new, worsening, or accompanied by other symptoms like fatigue, weight changes, numbness, or hair loss, it warrants investigation. Persistent cold intolerance that interferes with your daily comfort is worth discussing with your doctor and testing for with blood work.
Can low vitamin D cause cold sensitivity?
While vitamin D deficiency is not a direct cause of cold intolerance, it frequently coexists with conditions that are. Low vitamin D is associated with fatigue, muscle weakness, and mood changes, all of which can amplify the perception of cold. Some research also suggests vitamin D plays a role in vascular health and immune regulation. If you are investigating cold sensitivity, it is reasonable to include a vitamin D level (25-hydroxyvitamin D; normal: 30 to 100 ng/mL) in your blood panel.
Take Action on Your Cold Sensitivity
Constantly feeling cold is not something you have to accept as "just how you are." In most cases, it is a measurable signal from your body that something specific needs attention, whether that is a thyroid imbalance, depleted iron stores, unmanaged blood sugar, or chronic stress that has gone on too long.
The path forward is straightforward: get the right blood tests, identify the root cause, and address it with targeted interventions. At Mito Health, we make this process simple with comprehensive blood panels that cover thyroid function, iron status, B12, glucose metabolism, and more. You get clear results, actionable insights, and a personalized plan to help you feel warmer and healthier.
References
Garber JR, Cobin RH, Gharib H, et al. Clinical practice guidelines for hypothyroidism in adults: cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association. Thyroid. 2012;22(12):1200-1235. PMID: 23246686
Camaschella C. Iron-deficiency anemia. N Engl J Med. 2015;372(19):1832-1843. PMID: 25974669
Wigley FM, Flavahan NA. Raynaud's phenomenon. N Engl J Med. 2016;375(6):556-565. PMID: 27557303
Harvard Health Publishing. Why do I feel so cold all the time? health.harvard.edu
Pop-Busui R, Boulton AJM, Feldman EL, et al. Diabetic neuropathy: a position statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136-154. PMID: 27999003
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Order add-on tests and scans anytime
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$399
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One appointment, test at 2,000+ labs nationwide
Insights calibrated to your biology
Recommendations informed by your ethnicity, lifestyle, and history. Not generic ranges.
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Meet with your dedicated care team to review your results and define next steps
Lifetime health record tracking
Upload past labs and monitor your progress over time
Biological age analysis
See how your body is aging and what’s driving it
Order add-on tests and scans anytime
Access to advanced diagnostics at discounted rates for members
Concierge-level care, made accessible.
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Codeveloped with experts at MIT & Stanford
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Billed annually - cancel anytime
Bundle options:
Individual
$399
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