Hyperparathyroidism

What is hyperparathyroidism?

Hyperparathyroidism is a condition in which one or more of the parathyroid glands produce too much parathyroid hormone (PTH). The parathyroid glands are four small glands, each about the size of a grain of rice, located in the neck behind the thyroid gland. Despite their name and location, they have a completely different job from the thyroid. Their role is to regulate the level of calcium in the blood, which the body needs for healthy bones, nerve signaling, and muscle function.

Parathyroid hormone raises blood calcium in several ways: it releases calcium from the bones, tells the kidneys to hold on to calcium, and helps the intestines absorb more calcium from food. When too much PTH is produced, blood calcium levels can rise above normal — a state called hypercalcemia. Over time, this can weaken bones, strain the kidneys, and cause a wide range of symptoms.

So, in answer to the common question “what is hyperparathyroidism?” — it is essentially a hormone imbalance in which the body’s calcium “thermostat” is set too high. There are three main forms:

• Primary hyperparathyroidism — the problem starts in the parathyroid glands themselves, most often because of a benign (noncancerous) growth on one gland.
• Secondary hyperparathyroidism — the glands become overactive in response to another condition, most commonly chronic kidney disease or long-term vitamin D deficiency.
• Tertiary hyperparathyroidism — a less common form in which glands that have been overactive for a long time (usually due to kidney disease) continue producing excess hormone even after the original trigger is treated.

Hyperparathyroidism can affect anyone, but primary hyperparathyroidism is most often diagnosed in adults over 50 and is more common in women, particularly after menopause. In many cases it is discovered by chance, when a routine blood test shows a high calcium level in a person with few or no obvious complaints.

Symptoms of hyperparathyroidism

Hyperparathyroidism symptoms vary widely. Many people have mild or no symptoms, especially early on, and the condition is often found incidentally through blood tests. When symptoms do occur, they are mostly related to high blood calcium and to the long-term effects of PTH on bones and kidneys. Doctors sometimes summarize the classic picture as problems with “bones, stones, abdominal groans, and psychic moans.”

Common hyperparathyroidism symptoms include:

• Fatigue and weakness — feeling unusually tired or lacking energy, often described as feeling “run down”
• Bone and joint pain — aching bones, and over time thinning of the bones (osteoporosis) with an increased risk of fractures
• Kidney stones — excess calcium filtered by the kidneys can form painful stones
• Frequent urination and increased thirst — high calcium affects how the kidneys handle water
• Digestive complaints — nausea, constipation, loss of appetite, and in some cases abdominal pain
• Mood and memory changes — depression, irritability, anxiety, difficulty concentrating, or “brain fog”
• Muscle weakness or cramps

The pattern of symptoms often depends on the type and stage of the condition. In early or mild primary hyperparathyroidism, a person may notice only vague tiredness or low mood, or nothing at all. As calcium levels rise further or stay elevated for years, bone loss, kidney stones, and more pronounced symptoms tend to develop. In secondary hyperparathyroidism related to kidney disease, symptoms of the underlying kidney condition often dominate, and bone pain or itching may be prominent. Very high calcium levels — which are uncommon — can cause confusion, severe dehydration, vomiting, and abnormal heart rhythms, and this situation needs urgent medical care.

Because many of these complaints are nonspecific and can be caused by other conditions, hyperparathyroidism can go unrecognized for a long time. This is one reason blood testing plays such an important role in diagnosis.

Causes and risk factors

The causes of hyperparathyroidism depend on the type.

Primary hyperparathyroidism

• Parathyroid adenoma — in the large majority of cases, a single benign growth (adenoma) on one parathyroid gland makes it overactive.
• Hyperplasia — less often, two or more glands become enlarged and overactive without a distinct tumor.
• Parathyroid cancer — this is a rare cause, accounting for only a very small proportion of cases.

Secondary hyperparathyroidism

• Chronic kidney disease — damaged kidneys cannot activate vitamin D properly or remove phosphate efficiently, which lowers usable calcium and drives the parathyroid glands to work harder.
• Severe vitamin D deficiency — vitamin D is needed to absorb calcium from food; a long-term shortage prompts the glands to compensate.
• Calcium malabsorption — conditions that impair calcium absorption in the gut can have a similar effect.

Risk factors

Several factors are associated with a higher likelihood of developing hyperparathyroidism:

• Being a woman past menopause
• Older age, particularly over 50
• Previous radiation treatment to the head or neck
• Long-term, severe deficiency of calcium or vitamin D
• Certain inherited conditions, such as multiple endocrine neoplasia (MEN) syndromes — rare genetic disorders in which hormone-producing glands develop tumors
• Long-term use of lithium, a medication used for some mood disorders, which can affect parathyroid function in some people
• Chronic kidney disease, for the secondary form

Having a risk factor does not mean a person will develop the condition, and many people diagnosed with hyperparathyroidism have no identifiable risk factor at all.

Diagnosis

Hyperparathyroidism diagnosis relies primarily on blood tests rather than on symptoms, which are often vague. In many cases, the first clue is a high calcium level found on routine bloodwork.

Blood and urine tests

• Blood calcium — a persistently elevated calcium level raises suspicion of primary hyperparathyroidism.
• Parathyroid hormone (PTH) — measuring PTH is the key step. In primary hyperparathyroidism, PTH is high or inappropriately normal despite high calcium. In a healthy person, high calcium should suppress PTH, so the combination of both being elevated points strongly to the diagnosis.
• Vitamin D level — checked to identify deficiency, which can cause secondary hyperparathyroidism or complicate interpretation of the other results.
• Kidney function tests — creatinine and related tests help detect kidney disease and assess how the kidneys are coping.
• Phosphate — often low in primary hyperparathyroidism and high in kidney-related secondary forms.
• Urine calcium — a 24-hour urine collection may be used to measure how much calcium the kidneys are excreting and to rule out a rare inherited condition called familial hypocalciuric hypercalcemia, which can mimic hyperparathyroidism but usually does not require surgery.

Imaging and additional tests

Imaging is generally used not to make the diagnosis — which rests on blood tests — but to locate the overactive gland when surgery is being considered, and to look for complications:

• Neck ultrasound — a painless scan that can often identify an enlarged parathyroid gland.
• Sestamibi scan — a nuclear medicine test in which a small amount of a radioactive tracer highlights overactive parathyroid tissue.
• Bone density scan (DEXA) — measures bone strength to check for osteoporosis caused by long-term calcium loss from the skeleton.
• Kidney imaging — ultrasound or CT may be used to check for kidney stones or calcium deposits.

Your doctor may repeat blood tests over time before confirming the diagnosis, because calcium and PTH levels can fluctuate. Conditions such as this are typically evaluated and managed by an endocrinologist — a specialist in hormone disorders. At Acibadem, this evaluation falls under the Endocrinology & Metabolism department, often working together with surgeons and kidney specialists when needed.

Treatment options

Hyperparathyroidism treatment depends on the type of the condition, how high the calcium level is, whether complications such as bone loss or kidney stones are present, and the person’s age and overall health. Options range from careful monitoring to surgery.

Watchful waiting (active monitoring)

For people with mild primary hyperparathyroidism — only slightly elevated calcium, no symptoms, and no evidence of bone or kidney damage — doctors may recommend regular monitoring rather than immediate treatment. This usually involves periodic blood tests to check calcium and kidney function, and bone density scans at intervals. Monitoring is not the same as ignoring the condition; the goal is to act promptly if things change. People being monitored are typically advised to stay well hydrated, remain physically active, and avoid medications or situations that can raise calcium further, following their doctor’s individual guidance.

Medications

Medication does not cure primary hyperparathyroidism, but it can help control its effects in selected situations:

• Calcimimetics — drugs that mimic calcium and “trick” the parathyroid glands into releasing less hormone. They may be used when surgery is not possible or not appropriate, and in some cases of secondary hyperparathyroidism related to kidney disease.
• Bisphosphonates and other bone-protecting medicines — these can help slow bone loss and reduce fracture risk in people with osteoporosis linked to the condition.
• Vitamin D supplementation — carefully supervised correction of vitamin D deficiency is often part of treatment, particularly for secondary hyperparathyroidism. Dosing needs medical oversight, because in some situations vitamin D can raise calcium levels.
• Hormone therapy — in some postmenopausal women, hormone replacement therapy may help protect bone, weighed against its own risks and benefits.

In secondary hyperparathyroidism, treatment focuses mainly on the underlying cause — for example, managing chronic kidney disease, controlling phosphate levels through diet and phosphate-binding medicines, and correcting vitamin D deficiency.

Surgery

Surgical removal of the overactive gland or glands, called parathyroidectomy, is the only treatment that can cure primary hyperparathyroidism. It is generally recommended for people who have symptoms, significantly elevated calcium, osteoporosis, kidney stones, reduced kidney function, or who are younger at diagnosis. When a single adenoma is responsible, surgeons can often use a minimally invasive approach through a small incision in the neck, frequently guided by preoperative imaging and, in many centers, by measuring PTH levels during the operation to confirm the overactive tissue has been removed.

Parathyroid surgery is usually well tolerated, and many patients go home the same day or after a short stay. As with any operation, there are risks, including temporary or, rarely, lasting low calcium levels and, uncommonly, injury to the nerves that control the voice. A period of calcium and vitamin D supplementation is often needed after surgery while the remaining glands recover. In tertiary hyperparathyroidism, surgery to remove most of the parathyroid tissue may also be considered. More detail on the surgical and medical management pathway is available on the hyperparathyroidism treatment page.

The right hyperparathyroidism treatment is an individual decision. Your doctor may weigh factors such as your calcium level, bone health, kidney function, age, other medical conditions, and your own preferences before recommending a plan.

Living with hyperparathyroidism and outlook

For most people, the outlook with hyperparathyroidism is good, particularly when the condition is identified before serious complications develop. When primary hyperparathyroidism is caused by a single benign adenoma and that gland is successfully removed, calcium levels usually return to normal, and many symptoms — such as fatigue, poor concentration, and bone pain — often improve over the following months. Bone density frequently recovers to some degree after successful treatment, although this varies from person to person, and some effects of long-standing disease may not fully reverse.

People who are managed with monitoring rather than surgery can often live normal lives, provided they attend regular check-ups so that any progression is caught early. Practical measures that doctors commonly discuss include drinking enough fluids (unless restricted for another medical reason), staying physically active to support bone strength, getting adequate — but not excessive — calcium and vitamin D as advised by a clinician, and avoiding prolonged bed rest or dehydration, both of which can push calcium levels higher.

Secondary hyperparathyroidism generally improves when the underlying cause is treated, though in chronic kidney disease it may require ongoing management as part of overall kidney care. No treatment outcome can be guaranteed for any individual, and long-term follow-up is usually recommended even after successful surgery, since recurrence, while uncommon, is possible.

Frequently asked questions

What is hyperparathyroidism in simple terms?

Hyperparathyroidism means the parathyroid glands in the neck are making too much parathyroid hormone, the hormone that controls calcium in the blood. As a result, blood calcium often rises above normal, which can gradually affect the bones, kidneys, digestive system, and mood. It is usually caused by a benign growth on one gland or by another condition, such as kidney disease or vitamin D deficiency, that forces the glands to overwork.

Can hyperparathyroidism heal on its own?

Primary hyperparathyroidism caused by an adenoma does not generally go away by itself, because the overactive gland continues producing excess hormone. However, mild cases can remain stable for years, which is why monitoring is a reasonable option for some people. Secondary hyperparathyroidism, by contrast, often improves when its underlying cause — such as vitamin D deficiency — is corrected. Only a doctor can determine which situation applies to you.

How serious is hyperparathyroidism?

Seriousness varies widely. Many people have mild disease with few symptoms, while untreated, long-standing hyperparathyroidism can lead to osteoporosis, fractures, kidney stones, reduced kidney function, and, rarely, dangerously high calcium levels. Because complications develop slowly and treatment is effective in most cases, the condition is usually manageable when it is diagnosed and followed appropriately.

What are the first symptoms of hyperparathyroidism?

Early hyperparathyroidism symptoms are often subtle and easy to attribute to other causes: tiredness, low mood, mild aches, difficulty concentrating, increased thirst, or constipation. Some people have no symptoms at all, and the condition is discovered only when a blood test shows high calcium. More distinct problems, such as kidney stones or bone fractures, tend to appear later if the condition goes untreated.

Is surgery always necessary for hyperparathyroidism?

No. Surgery is the only cure for primary hyperparathyroidism and is often recommended when there are symptoms or complications, but people with mild disease may be safely followed with regular blood tests and bone density scans instead. Medications can help control calcium or protect bone in selected cases. The decision depends on individual factors and should be made together with an endocrinologist and, where relevant, a surgeon.

What is recovery like after parathyroid surgery?

Recovery from parathyroid surgery is typically fairly quick. Many patients leave the hospital the same day or the next day and return to routine activities within days to a couple of weeks, depending on the individual and the surgical approach. Calcium levels are monitored closely afterward, and temporary calcium or vitamin D supplements are often needed while the remaining glands resume normal function. Your surgical team will provide specific guidance based on your situation.

Does diet cause or cure hyperparathyroidism?

Diet does not cause primary hyperparathyroidism, and no diet can cure it. That said, severe long-term calcium or vitamin D deficiency can contribute to secondary hyperparathyroidism, and staying hydrated and maintaining adequate — not excessive — calcium intake, as advised by your doctor, can support overall management. People with this condition are generally advised not to make major dietary changes or start supplements without medical guidance, because both too little and too much calcium can be problematic.

When to see a doctor

You should discuss testing with a doctor if you have persistent unexplained fatigue, bone or joint pain, repeated kidney stones, frequent urination with excessive thirst, ongoing constipation, or unexplained changes in mood or memory — especially if a blood test has ever shown a high calcium level. People already diagnosed with hyperparathyroidism should keep their scheduled follow-up appointments even when they feel well.

Seek urgent medical attention if you or someone with known or suspected hyperparathyroidism develops any of the following red-flag warning signs, which can indicate dangerously high calcium levels:

• Confusion, unusual drowsiness, or difficulty staying awake
• Severe nausea or repeated vomiting with inability to keep fluids down
• Signs of severe dehydration, such as very little urine, dizziness, or a racing heartbeat
• Irregular or pounding heartbeat, chest pain, or fainting
• Severe abdominal pain that does not improve
• Sudden severe flank or back pain with blood in the urine, which may indicate a kidney stone blocking urine flow
• Marked muscle weakness that comes on quickly

These symptoms can have many causes, but in a person with hyperparathyroidism they should never be ignored. Prompt evaluation allows doctors to check calcium levels and treat any complication before it becomes more serious.