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Low Estrogen Symptoms: Signs of Low Estradiol, Causes and Testing

Low estrogen can cause hot flashes, night sweats, vaginal dryness, irregular or missed periods, poor sleep, mood changes and bone loss over time. Symptoms alone cannot confirm it. Learn the less familiar signs, what causes low estrogen at each life stage, what it looks like in men, and how estradiol, FSH and LH testing shows what is going on.

Published

August 27, 2026

Last updated

October 23, 2026

Read time

11 min read

Medically reviewed by

Rhonda Collins, FNP-C

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Low estrogen symptoms most often include hot flashes and night sweats, vaginal dryness or pain during sex, irregular or missed periods, trouble sleeping, mood changes, and bone loss over time ^[1][2]. Symptoms alone cannot confirm low estrogen, because many other conditions cause the same signs. A blood test for estradiol (E2), the main estrogen in women before menopause, read alongside the pituitary hormones FSH and LH, is how you find out ^[1][3]. A low result is not always a problem: estradiol is expected to fall after menopause, and it rises and falls across the menstrual cycle.

The estradiol biomarker overview explains what the marker measures. For the opposite result, see high estrogen symptoms.

Low Estrogen Symptoms in Women

Estrogen matters for more than periods and pregnancy. It also supports bone and muscle strength and brain functions such as focus ^[1]. That is why low estrogen symptoms in women fall into several groups. Most people notice a few of them rather than all of them, and some people notice none ^[4].

Hot flashes and night sweats

A hot flash is a sudden feeling of heat that rushes to the face and upper body. It can last from a few seconds to several minutes, and some women have them a few times a month while others have them several times a day ^[4]. Hot flashes at night are night sweats, and they can wake you up and leave you tired the next day ^[4]. Skin flushing often comes with them ^[2]. MedlinePlus notes that hot flashes are usually worst during the first 1 to 2 years of menopause ^[2]. The hot flashes after menopause page covers that stage in more detail.

Vaginal and urinary symptoms

As estrogen falls, the lining of the vagina becomes thinner, drier and less elastic. That can cause vaginal dryness, itching and pain during sex ^[4][5]. The urethra can also become dry and irritated, which can mean needing to urinate more often and more urinary tract infections ^[4]. Urine leakage and more frequent vaginal infections are also listed menopause symptoms ^[2]. Together these changes are called genitourinary syndrome of menopause. It affects an estimated 27% to 84% of postmenopausal women, and it is likely underdiagnosed ^[6].

Period changes

A change in the menstrual cycle is often the first sign that estrogen is fluctuating. Cycles may get longer or shorter, periods may be skipped, and the flow may become lighter or heavier ^[4]. Periods that stop well before menopause, in someone who is not pregnant, can come from stress, weight loss or heavy exercise switching off ovulation ^[7].

Sleep, mood and concentration

Low estrogen around menopause can bring insomnia or waking much earlier than usual, and night sweats can break up sleep further ^[4]. Mood swings, irritability, anxiety and depression are also listed symptoms ^[2]. Many women notice forgetfulness or slower thinking through the menopause transition, often called brain fog ^[2][8]. See brain fog during menopause for that symptom on its own.

Skin and hair

Estrogen supports collagen, moisture and blood flow in the skin. After menopause, lower estrogen is linked to thinner and drier skin, less elasticity, more wrinkling, slower wound healing and hair loss ^[9].

Bone loss

Estrogen helps keep bone strong. Women lose bone faster in the first 4 to 8 years after menopause because estrogen levels drop, and losing too much bone raises the risk of osteoporosis ^[4]. Postmenopausal bone loss related to estrogen deficiency is the main contributor to osteoporosis in women ^[10]. A bone density scan, not an estradiol result, is the test that looks for that bone loss ^[2].

Weird Symptoms of Low Estrogen

Some low estrogen symptoms surprise people because they do not seem hormonal. Menopause symptom lists from MedlinePlus include several of them ^[2]:

• A pounding or racing heart, or an irregular heartbeat (palpitations).
• Joint aches and pains. Researchers now use the term musculoskeletal syndrome of menopause for the joint pain, loss of muscle and loss of bone linked to falling estrogen, and estimate that more than 70% of women have musculoskeletal symptoms during the transition ^[11].
• Headaches.
• Forgetfulness ^[2][8].
• Urine leakage, and vaginal or urinary infections that come back more often ^[2][4].
• Dry or thinning skin and thinning hair ^[9].

Each of these has many other causes, so a less familiar symptom is a reason to test rather than proof of low estrogen.

What Causes Low Estrogen

Low estrogen happens when the ovaries make less of it, when the brain stops signaling the ovaries, or when a medicine blocks or lowers it. The likely cause depends on your age and life stage.

• Perimenopause and menopause. Estrogen from the ovaries begins to fluctuate in the 30s and 40s, then falls as the ovaries stop releasing eggs. Menopause is complete after 12 months without a period, usually between ages 45 and 55 ^[2][4]. The perimenopause symptoms and blood tests article covers the transition.
• After childbirth and while breastfeeding. Estrogen levels are lower right after childbirth and during breastfeeding, and some women develop vaginal dryness then ^[5]. In one study of women at their postpartum checkup, signs of vaginal atrophy were much more common in those who were breastfeeding ^[12]. See hot flashes in postpartum women for related symptoms.
• Low energy availability and stress. Weight loss, excessive exercise and stress, often in combination, can stop ovulation without any other disease. This is called functional hypothalamic amenorrhea, and bone loss and infertility are among its complications ^[7]. In women, low FSH can come with rapid weight loss, being very underweight, or extreme exercise ^[3], and severe stress is a listed cause of falling estrogen ^[5].
• Primary ovarian insufficiency (POI). In POI, the ovaries stop working normally before age 40, and periods become irregular or stop. Some women with POI still have occasional periods. In most cases the cause is unknown, but genetic conditions such as Turner syndrome and Fragile X, autoimmune disease, chemotherapy and radiation can cause it ^[13]. An international guideline estimates that POI affects about 3.5% of women ^[14].
• Removal of both ovaries. Surgery that removes both ovaries causes menopause right away. Symptoms of this surgical menopause can be more severe and start more suddenly ^[2].
• Medicines and cancer treatment. Chemotherapy, radiation to the pelvis, and medicines or hormones used to treat breast cancer, endometriosis, fibroids or infertility can all lower estrogen ^[2][5].
• Pituitary and hypothalamus conditions. The pituitary gland makes FSH and LH, which tell the ovaries to make estrogen. Conditions that affect the pituitary or hypothalamus can lower FSH, LH and estrogen together ^[3].

A cause on this list is a possibility to check, not a diagnosis. Weight changes come up often with low estrogen. The estrogen and weight gain article covers that question on its own.

Low Estrogen in Men

Men need estrogen too. Most of a man’s estradiol is made by converting testosterone, and in men it helps regulate the hormone signals to the testes, reproductive function, bone growth and strength, body composition, blood sugar, and the body’s control of hot flashes ^[15]. So low estrogen in men usually travels with low testosterone, or follows medicines that block that conversion. Aromatase inhibitors raise testosterone but lower estradiol, and hormone therapy for prostate cancer lowers both ^[15].

In a trial that lowered sex hormones in healthy men aged 20 to 50, low estrogen mainly accounted for an increase in body fat, while low testosterone accounted for loss of muscle and strength. Low levels of both contributed to lower sex drive ^[16]. Signs to watch for in men include lower sex drive, more belly fat, bone loss, and hot flashes in men.

Male estradiol is low to begin with, so measuring it accurately needs the right assay (see the testing section below).

How Low Estrogen Is Tested

Low estrogen is assessed with a blood test for estradiol, read with the pituitary hormones FSH and LH and with your age, cycle and medicines ^[1][3]. The pattern across the three tells you more than estradiol alone.

• Low estradiol with high FSH points to the ovaries making less estrogen, as in perimenopause, menopause and primary ovarian insufficiency. The pituitary raises FSH to try to make the ovaries respond ^[3]. An international guideline now allows POI to be diagnosed after one elevated FSH result above 25 IU/L in the right clinical setting, with repeat testing when the picture is unclear ^[14].
• Low estradiol with low or normal FSH and LH points to the brain not signaling the ovaries or testes, as in pituitary conditions, undereating, weight loss or heavy training ^[3][7].
• FSH and LH in men help show whether low hormone levels come from the testes or from the pituitary ^[3].

The LH, FSH and estradiol (E2) panel measures all three from one blood draw. The estradiol (E2) blood test and the follicle-stimulating hormone (FSH) blood test are the individual tests. If you also want progesterone, prolactin, testosterone and other markers, the at-home women’s hormone test kit includes estradiol, FSH and LH among a wider set.

When to test and when a low result is expected

• Timing in the cycle. In women who still have periods, estrogen changes a lot, so more than one test may be needed to see a trend ^[1]. FSH may need to be drawn at a set point in the cycle ^[3]. Note the first day of your last period so each result can be read against your cycle day.
• After menopause. Estrogen declines after menopause and FSH rises, so a low estradiol with a high FSH is the expected pattern at that stage ^[1][3].
• Age 45 and over with typical symptoms. FSH testing is usually not needed to confirm perimenopause at this age, because high FSH is a normal sign of it. Testing is more useful when symptoms start before 45, before 40, or when the cause is unclear ^[3]. Because levels swing from cycle to cycle, your hormone levels may need to be checked several times to confirm menopause status if you still have periods ^[2].
• Hormonal birth control and hormone therapy. Birth control pills and menopause hormone therapy can change the result. You may be asked to stop some medicines before testing, but do not stop any medicine unless the prescriber tells you to ^[1].

When a more sensitive estradiol test matters

Standard estradiol tests are reasonably well suited to the levels seen in fertility testing. An Endocrine Society statement found that very low estradiol concentrations are too low for routine methods to measure accurately or precisely ^[17]. Very low levels are what you expect in men, in children, after menopause and in people taking aromatase inhibitors. In those settings, a mass spectrometry test such as the ultrasensitive estradiol (E2) test is the better fit. The estradiol test cost guide compares the test types.

Reference ranges differ by lab, sex, age, cycle phase and menopause status, so read your result against the range printed on your report. For how the expected range shifts across the cycle and after menopause, see estradiol levels by age and life stage.

Why One Result Cannot Diagnose Low Estrogen

An estradiol result should not be used by itself to diagnose menopause, infertility, ovarian insufficiency, hypogonadism, or a bone disorder. It also should not be used alone to start or change hormone treatment. Interpretation depends on why the test was ordered, your age and sex, menstrual or menopause status, pregnancy or postpartum status, the timing of the sample, hormone medicines, and the laboratory method. The same low number can be expected in one setting and a sign of a problem in another.

Testing provides a measurement, not a diagnosis. Review an unexpected or persistently low result with your clinician, together with your symptoms, cycle history and the FSH and LH results.

When to Get Prompt Care

Seek prompt medical assessment for severe pelvic or abdominal pain, heavy bleeding, any vaginal bleeding after menopause, fainting, chest pain, or symptoms that could relate to a pregnancy complication. These symptoms require evaluation regardless of the estradiol result. Periods that stop before age 40 are also worth checking, because primary ovarian insufficiency affects fertility and bone health ^[13][14].

References

1. MedlinePlus: Estrogen levels test
2. MedlinePlus: Menopause
3. MedlinePlus: Follicle-stimulating hormone (FSH) levels test
4. American College of Obstetricians and Gynecologists: The menopause years
5. MedlinePlus: Vaginal dryness
6. The 2020 genitourinary syndrome of menopause position statement of The North American Menopause Society. Menopause, 2020
7. Gordon CM, et al. Functional hypothalamic amenorrhea: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab, 2017
8. Maki PM, Jaff NG. Brain fog in menopause: a health-care professional’s guide for decision-making and counseling on cognition. Climacteric, 2022
9. Thornton MJ. Estrogens and aging skin. Dermatoendocrinol, 2013
10. Management of osteoporosis in postmenopausal women: the 2021 position statement of The North American Menopause Society. Menopause, 2021
11. Wright VJ, et al. The musculoskeletal syndrome of menopause. Climacteric, 2024
12. Lev-Sagie A, et al. Prevalence and characteristics of postpartum vulvovaginal atrophy and lack of association with postpartum dyspareunia. J Low Genit Tract Dis, 2020
13. MedlinePlus: Primary ovarian insufficiency
14. Panay N, et al. Evidence-based guideline: premature ovarian insufficiency. Hum Reprod Open, 2024
15. Russell N, Grossmann M. Estradiol as a male hormone. Eur J Endocrinol, 2019
16. Finkelstein JS, et al. Gonadal steroids and body composition, strength, and sexual function in men. N Engl J Med, 2013
17. Rosner W, et al. Challenges to the measurement of estradiol: an Endocrine Society position statement. J Clin Endocrinol Metab, 2013

Related Resources

• Estradiol biomarker overview
• FSH biomarker overview
• LH biomarker overview
• High estrogen symptoms
• Estradiol levels by age and life stage
• The perimenopause playbook: estradiol and progesterone
• Perimenopause symptoms and blood tests
• Estradiol test cost guide
• Does estrogen cause weight gain?

Frequently asked questions

What are the first signs of low estrogen?

In women who still have periods, a change in the cycle is often the first sign: periods that come closer together or further apart, skipped periods, or a lighter or heavier flow. Hot flashes, night sweats and trouble sleeping often follow. None of these signs is specific to low estrogen, so they are a reason to look further rather than a diagnosis.

Does a low estradiol result mean menopause?

Not by itself. Estradiol often declines around menopause, but levels can fluctuate and symptoms, menstrual history, age, and other clinical information matter. One result should not be used alone to diagnose menopause. Menopause is confirmed once you have gone 12 months without a period.

Can you have low estrogen without being in menopause?

Yes. Estrogen is lower after childbirth and while breastfeeding, and it can fall with undereating, weight loss or heavy training, with primary ovarian insufficiency before age 40, after both ovaries are removed, and with some medicines and cancer treatments. Pituitary and hypothalamus conditions can lower it too.

Can low estradiol affect bones?

Estrogen helps maintain bone tissue. Persistently low estrogen exposure can contribute to bone loss, but an estradiol result alone does not measure bone density or determine fracture risk. A bone density scan is the test that measures bone.

Can exercise or undereating lower estradiol?

Low energy availability can disrupt hormone signaling and menstrual function in some people. The appropriate assessment considers nutrition, exercise, menstrual history, and other possible causes rather than assuming the estradiol result has one explanation.

Can men have low estrogen?

Yes. Men make estradiol mostly by converting testosterone, so low estrogen in men usually travels with low testosterone. It can also follow aromatase inhibitor use or hormone therapy for prostate cancer. In men, low estradiol is linked to bone loss, more body fat, lower sex drive and hot flashes.

Should I start estrogen because my result is low?

Do not start or change estrogen or other hormone medicines based on one result. Benefits, risks, formulations, and contraindications depend on the reason for treatment and the individual clinical context.