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Hyperparathyroidism Symptoms: What to Look For, and the Blood Tests That Confirm It

Most people with hyperparathyroidism have no symptoms and find out from a routine calcium result. Here are the symptoms when they do appear, the three types, and how calcium, PTH, vitamin D, phosphate and kidney results are read together to tell them apart.

Published

November 8, 2026

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13 min read

Medically reviewed by

Rhonda Collins, FNP-C

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Most people with hyperparathyroidism have no symptoms. The condition is usually found when a routine blood test shows a high calcium level, and the diagnosis is then made with a parathyroid hormone (PTH) test from the same blood draw ^[1][2]. When symptoms do appear, they tend to be mild and easy to put down to something else: tiredness, weakness, low mood, and aches in the bones and joints ^[1]. More advanced disease can thin the bones and cause kidney stones ^[1].

The useful question is not only “what are the symptoms?” but “which results point to which kind of hyperparathyroidism?” There are three types, and they leave different patterns across calcium, PTH, vitamin D, phosphate and kidney tests. This article explains those patterns, when to repeat a test, and when to see an endocrinologist.

What hyperparathyroidism is

Hyperparathyroidism means one or more of the parathyroid glands makes too much PTH ^[2]. The four parathyroid glands are pea-sized and sit on or near the thyroid in the neck, but despite the name they are not related to the thyroid ^[1].

PTH has one main job: keeping blood calcium in a narrow range. It raises calcium by releasing it from bone, helping the gut absorb calcium from food, and helping the kidneys hold on to calcium instead of passing it in urine ^[1]. When calcium is high, a healthy parathyroid should go quiet and PTH should fall ^[3]. Hyperparathyroidism is what happens when PTH stays high anyway, either because a gland has become overactive or because the body is reacting to a problem elsewhere.

Primary hyperparathyroidism is one of the most common hormone disorders. About 100,000 people in the United States develop it each year, most often between ages 50 and 60, and women are affected 3 to 4 times more often than men ^[1].

Hyperparathyroidism symptoms

Many people have no symptoms

NIDDK states that most people with primary hyperparathyroidism have no symptoms, and that doctors usually catch it early through routine blood tests ^[1]. MedlinePlus says the same: the condition is often discovered when blood is tested for another reason and calcium comes back high ^[2]. StatPearls describes the typical presentation as having shifted from classic symptomatic disease to mostly symptom-free high calcium found by chance, a shift driven by routine blood chemistry testing ^[4].

This is why a normal-feeling person with a high calcium result is the usual reader of this page, not the exception. A calcium level is part of every comprehensive metabolic panel, so many people first see the number there.

Bones, stones, groans and moans

The classic description of the disease, credited to Fuller Albright, is “stones, bones, groans, and moans” ^[5]. Each word maps to a group of symptoms:

• Bones: bone pain, thinning bones and fractures, because PTH pulls calcium out of bone ^[5][1]. MedlinePlus lists fragile bones of the limbs and spine that break easily ^[2].
• Stones: kidney stones, from extra calcium passing through the kidneys into urine ^[5][1].
• Groans: abdominal pain and digestive discomfort, often from constipation caused by high calcium, along with nausea and loss of appetite ^[5][2].
• Moans: tiredness, weakness, depression, forgetfulness and trouble concentrating ^[1][2].

Symptoms of more severe disease

NIDDK lists these in people with more severe disease ^[1]:

• loss of appetite, nausea and vomiting
• constipation
• confusion
• increased thirst and urination

These overlap with the symptoms of high calcium from any cause. Our guide to high calcium symptoms covers the full list and the levels at which they tend to appear. Confusion, vomiting, heavy thirst or very little urine alongside a high calcium result needs same-day medical care rather than more tests.

Primary, secondary and tertiary hyperparathyroidism

The type depends on where the problem starts, and the calcium level is the main clue ^[3].

Primary hyperparathyroidism

In primary hyperparathyroidism the problem is in the parathyroid glands themselves ^[1]. In about 8 out of 10 people, it is a single benign growth called an adenoma ^[1]. Most other cases involve two or more adenomas, or enlargement of all four glands (hyperplasia). Parathyroid cancer is a rare cause ^[1][2]. Inherited conditions such as multiple endocrine neoplasia type 1 are more likely when more than one gland is involved, and radiation to the head and neck raises the risk ^[1][2].

The gland ignores the normal calcium feedback, so calcium is high and PTH is high or stays in the normal range when it should have fallen ^[1][4].

Secondary hyperparathyroidism

In secondary hyperparathyroidism the parathyroid glands are working as designed. They are making extra PTH because something outside the glands is pushing calcium down ^[3]. MedlinePlus describes it as high PTH with low blood calcium ^[3]. Calcium can also sit in the normal range, which is why secondary causes have to be ruled out before a high PTH with normal calcium is put down to the glands themselves ^[6]. The two most common drivers are:

• Vitamin D deficiency. Low vitamin D means less calcium is absorbed, and the parathyroid glands respond. NIDDK notes that a very low vitamin D level can cause a secondary form of hyperparathyroidism that resolves when vitamin D is brought back to normal ^[1].
• Chronic kidney disease. Damaged kidneys stop turning vitamin D into its active form and stop clearing phosphorus well. Both changes lower calcium and push the parathyroid glands to release more PTH ^[7]. NIDDK notes that anyone with chronic kidney disease is likely to have some degree of this mineral and bone disorder, and that it progresses as kidney function declines ^[7].

Low calcium intake, conditions that block absorption of nutrients from food, and low magnesium can also cause it ^[2][3]. Treatment is aimed at the cause rather than the glands ^[6].

Tertiary hyperparathyroidism

Tertiary hyperparathyroidism can develop after long-standing secondary hyperparathyroidism, most often in chronic kidney failure. After years of stimulation, all four glands enlarge and begin making PTH almost on their own, so calcium turns high instead of low ^[8][6]. Hyperparathyroidism also frequently persists after a kidney transplant ^[9].

How the blood tests are read together

No single number diagnoses hyperparathyroidism. NIDDK makes the diagnosis of primary hyperparathyroidism from calcium and PTH together ^[1], and MedlinePlus says PTH results are interpreted alongside a calcium result and other tests ^[3]. The workup MedlinePlus lists includes calcium, PTH, phosphorus, magnesium, 25-hydroxy vitamin D, creatinine and alkaline phosphatase ^[2].

What each test adds

• Calcium. The starting point. Total calcium is on routine chemistry panels. Our calcium reference page explains the marker.
• Corrected or ionized calcium. Calcium in blood is split between a form bound to proteins, mainly albumin, and a free (ionized) form that does the work ^[10]. If albumin is low, total calcium can read lower than the true level. Corrected calcium adjusts for albumin, and an ionized calcium test measures the free form directly ^[10]. See our corrected calcium page for how the adjustment works.
• Intact PTH. Tells you whether the parathyroid glands are driving the calcium or responding to it. A PTH inside its printed range can still be inappropriately normal when calcium is high, because a healthy gland would have switched off ^[1]. Our PTH reference page covers this in detail.
• 25-hydroxy vitamin D. Low vitamin D is common in primary hyperparathyroidism and can push PTH higher still, and on its own it can cause secondary hyperparathyroidism ^[1]. See our vitamin D page.
• Phosphate. Primary hyperparathyroidism typically lowers phosphate ^[5], while kidney disease raises it ^[7]. That makes phosphate one of the clearest ways to separate a kidney cause from a parathyroid one.
• Creatinine and eGFR. Show kidney function, the main cause of secondary and tertiary hyperparathyroidism ^[7][8]. See creatinine and eGFR.

Result patterns and what they usually point to

These are the common patterns, using your laboratory’s own reference ranges. They point toward a likely explanation; they do not diagnose one.

A few notes on the less obvious rows:

• Normocalcemic primary hyperparathyroidism. StatPearls defines it as high PTH from the glands themselves while albumin-adjusted and ionized calcium stay normal on at least two tests over 6 months ^[6]. Every cause of secondary hyperparathyroidism, especially low vitamin D and kidney disease, has to be ruled out first. Many people with it go on to develop high calcium, so calcium keeps being monitored ^[6].
• High calcium with low PTH. NIDDK notes that in primary hyperparathyroidism, excess PTH is the only source of the high calcium ^[1]. When PTH is low, the cause lies elsewhere, such as too much vitamin D or calcium from supplements ^[3], or, less often, cancer. Our article on whether high calcium is a sign of cancer covers that pattern and its next tests.
• Familial hypocalciuric hypercalcemia. Its blood results can look like primary hyperparathyroidism. A 24-hour urine collection for calcium and creatinine helps tell the two apart, and helps tell primary hyperparathyroidism from a kidney cause ^[1].

Repeat testing before drawing conclusions

A single high calcium result is a reason to recheck, not a diagnosis. Three habits make the results easier to read:

• Test calcium and PTH in the same draw. Because PTH only makes sense against the calcium level at that moment, MedlinePlus notes the two are usually ordered together ^[3].
• Check calcium against albumin. A total calcium result is easier to trust when albumin is normal. When it is not, corrected or ionized calcium gives a truer picture ^[10].
• Confirm a borderline result. Diet and medicines can shift a calcium result, so an out-of-range value does not always mean a condition that needs treatment ^[10]. Bring a list of everything you take, including vitamin D, calcium and water pills, to whoever reviews the repeat. Normocalcemic disease is defined by at least two normal calcium results over 6 months, which shows how much weight repeat values carry in this workup ^[6].

When to see an endocrinologist

Hyperparathyroidism is usually diagnosed and managed by an endocrinologist, with a parathyroid surgeon involved when surgery is considered. A referral usually makes sense when:

• calcium is high on a repeat test and PTH is high or inappropriately normal;
• PTH is high with normal calcium and vitamin D and kidney function do not explain it;
• you have kidney stones, low bone density or a fracture from a minor fall, together with a high calcium or PTH result.

Once primary hyperparathyroidism is diagnosed, NIDDK lists the usual follow-up tests: a bone density (DXA) scan, kidney imaging for stones, and a vitamin D level ^[1]. A 24-hour urine collection is also part of the workup ^[1][2].

How hyperparathyroidism is treated

Treatment depends on the type. This is an overview of what the sources describe, not advice for any one person.

Primary hyperparathyroidism

Surgery to remove the overactive gland or glands, called parathyroidectomy, is the only treatment that cures primary hyperparathyroidism ^[1][4]. StatPearls reports cure rates above 95 percent, with bone density and kidney function typically improving afterwards ^[4]. When one gland is the source, a minimally invasive operation through a small incision is often possible, and imaging is used before surgery to find the gland ^[1].

Not everyone needs surgery. International guidelines set out criteria for surgery in people without symptoms, and the most recent update, from the Fifth International Workshop in 2022, revised the kidney criteria ^[11]. NIDDK describes the criteria in general terms ^[1]:

• blood calcium more than 1 mg/dL above the upper limit of normal
• low bone density on a DXA scan, or a fracture from little force
• kidney stones, kidney calcification, or high stone risk on a 24-hour urine test
• age under 50

People with symptoms or complications are usually advised to have surgery, and NIDDK notes that surgery can also be reasonable for people who do not meet the criteria ^[1]. Those with mild disease, slightly high calcium, and normal kidneys and bones may be monitored instead, with yearly blood tests for calcium and kidney function and a bone density scan every 1 to 2 years ^[1]. Surgery is reconsidered if the disease progresses. For people who cannot have surgery, medicines can lower calcium or protect bone density ^[1].

Secondary and tertiary hyperparathyroidism

Secondary hyperparathyroidism is treated by addressing its cause ^[6]. When low vitamin D is the driver, PTH usually returns to normal once vitamin D is restored ^[1]. In kidney disease, treatment aims to control phosphorus, calcium and PTH through diet, medicines, dialysis or a kidney transplant, and sometimes surgery on the parathyroid glands ^[7][2]. When the glands stop responding to medical treatment, as in refractory secondary and in tertiary disease, surgery on the parathyroid glands is often needed ^[9].

Where to start

If a routine test showed a high calcium, or you have symptoms that fit, the first step is calcium and PTH from the same draw. The Calcium and PTH test measures both together. If you already have a same-day calcium, the PTH test works on its own, and a standalone calcium test suits a repeat check. Add a vitamin D test to look for the most common secondary cause, and a kidney profile or a phosphate test when kidney function is the question. Mito orders the tests and a clinician reviews your results.

For the vitamin D side of the picture, see low vitamin D symptoms and causes.

References

1. National Institute of Diabetes and Digestive and Kidney Diseases. Primary Hyperparathyroidism.
2. MedlinePlus Medical Encyclopedia. Hyperparathyroidism.
3. MedlinePlus. Parathyroid Hormone (PTH) Test.
4. Helbing A, Leslie SW, Levine SN. Primary Hyperparathyroidism. StatPearls. 2026.
5. Mishra B, et al. Normo-hormonal primary hyperparathyroidism presenting with recurrent acute pancreatitis. JCEM Case Rep. 2026.
6. Leslie SW, Levine SN. Normocalcemic Hyperparathyroidism. StatPearls. 2024.
7. National Institute of Diabetes and Digestive and Kidney Diseases. Mineral and Bone Disorder in Chronic Kidney Disease.
8. Chandran M, Wong J. Secondary and Tertiary Hyperparathyroidism in Chronic Kidney Disease: An Endocrine and Renal Perspective. Indian J Endocrinol Metab. 2019;23(4):391-399.
9. Muppidi V, et al. Secondary Hyperparathyroidism. StatPearls. 2023.
10. MedlinePlus. Calcium Blood Test.
11. Bilezikian JP, et al. Evaluation and Management of Primary Hyperparathyroidism: Summary Statement and Guidelines from the Fifth International Workshop. J Bone Miner Res. 2022;37(11):2293-2314.

Frequently asked questions

How long can you live with hyperparathyroidism?

The outlook depends on the cause. For primary hyperparathyroidism it is generally excellent: surgery cures more than 95 percent of people, and those who are monitored instead often stay stable for years with regular checks. Untreated, it can lead over time to bone loss, kidney stones and other complications, which is why it is followed rather than ignored.

Is hyperparathyroidism genetic?

Usually not. Most primary hyperparathyroidism comes from a single benign growth on one parathyroid gland that forms without a known cause. A small share is linked to inherited conditions such as multiple endocrine neoplasia type 1, which are more likely when more than one gland is involved. Radiation to the head and neck also raises the risk. Familial hypocalciuric hypercalcemia is a separate rare inherited condition whose blood results can look like primary hyperparathyroidism; a 24-hour urine calcium test helps tell them apart.

Is hyperparathyroidism the same as hyperthyroidism?

No. The parathyroid glands are four small glands that sit on or near the thyroid in the neck, but they are not related to it. Hyperparathyroidism means too much parathyroid hormone, which raises blood calcium. Hyperthyroidism means too much thyroid hormone, which speeds up metabolism. They are diagnosed with different blood tests.