Primary Hyperparathyroidism
What is Primary Hyperparathyroidism?
Primary hyperparathyroidism is a condition where one or more of your four parathyroid glands become overactive. These tiny glands sit behind your thyroid in your neck. They normally produce parathyroid hormone, or PTH, which helps control calcium levels in your blood.
When these glands produce too much PTH, your calcium levels rise above normal. This happens most often because of a benign tumor called an adenoma on one of the glands. The excess PTH pulls calcium from your bones into your bloodstream. Over time, this can weaken your bones and cause other health problems throughout your body.
Primary hyperparathyroidism affects about 1 in 500 women and 1 in 2,000 men. It becomes more common after age 50. Many people with mild cases have no symptoms at first. Others experience fatigue, kidney stones, or bone pain that brings them to seek testing.
Symptoms
- Fatigue and weakness that does not improve with rest
- Kidney stones that form repeatedly
- Bone pain or fractures that happen easily
- Frequent urination and excessive thirst
- Nausea, vomiting, or loss of appetite
- Constipation and digestive problems
- Memory problems and difficulty concentrating
- Depression or mood changes
- Muscle aches and joint pain
- Abdominal pain or heartburn
Many people with primary hyperparathyroidism have no obvious symptoms early on. The condition is often discovered during routine blood work that shows high calcium levels. Some people feel vaguely unwell for years before diagnosis.
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Causes and risk factors
Primary hyperparathyroidism happens when one or more parathyroid glands grow abnormally and produce too much PTH. About 80% of cases are caused by a benign tumor called an adenoma on a single gland. Another 15% to 20% result from hyperplasia, where all four glands become enlarged. Rarely, parathyroid cancer causes the condition. The exact reason these glands become overactive is not fully understood.
Risk factors include being female, being over age 50, and past radiation exposure to the head or neck. Some people inherit gene mutations that affect parathyroid function. Certain medications like lithium can trigger the condition. Low vitamin D levels may stress the parathyroid glands over time. Postmenopausal women face higher risk due to hormonal changes that affect calcium metabolism.
How it's diagnosed
Primary hyperparathyroidism is diagnosed through blood tests that measure calcium and parathyroid hormone levels. High or high-normal calcium combined with elevated PTH confirms the diagnosis. Your doctor will also check your vitamin D levels, since low vitamin D can affect PTH production. Kidney function tests help assess whether high calcium has affected your kidneys.
Rite Aid offers parathyroid hormone testing and vitamin D testing as add-ons to our flagship blood panel. You can get tested at over 2,000 Quest Diagnostics locations nationwide. Additional imaging tests like ultrasound or sestamibi scans may help locate which gland is overactive if surgery is being considered. Bone density scans check for bone loss caused by the condition.
Treatment options
- Surgery to remove the overactive parathyroid gland or glands, which cures most cases
- Active monitoring with regular blood tests if your case is mild and not causing symptoms
- Drinking plenty of water to prevent kidney stones and help kidneys flush excess calcium
- Regular exercise, especially weight-bearing activities, to maintain bone strength
- Avoiding thiazide diuretics and high-dose calcium supplements that can worsen calcium levels
- Calcimimetic medications like cinacalcet that lower calcium by mimicking calcium in the body
- Bisphosphonate medications to prevent bone loss if surgery is not an option
- Ensuring adequate but not excessive vitamin D intake
- Limiting dietary calcium to normal amounts, not restricting it severely
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- Simple blood draw at your nearest lab
- Results in days, not weeks
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Frequently asked questions
Primary hyperparathyroidism occurs when the parathyroid glands themselves malfunction and produce too much PTH. Secondary hyperparathyroidism happens when another condition, like kidney disease or vitamin D deficiency, causes the glands to work overtime. Primary hyperparathyroidism typically causes high calcium levels, while secondary usually shows low or normal calcium.
Primary hyperparathyroidism does not go away without treatment. The overactive gland will continue producing excess PTH. Surgery is the only cure for most cases. Some people with very mild disease can be monitored safely for years, but the condition itself does not resolve spontaneously.
Primary hyperparathyroidism usually progresses slowly over many years. Some people have stable, mild disease for decades. Others experience worsening bone loss, kidney stones, or symptoms within a few years. Regular monitoring with blood tests helps track how the condition is changing over time.
Surgery is recommended for people with symptoms, kidney stones, bone loss, or very high calcium levels. If you have mild disease with no symptoms and normal bone density, your doctor may suggest active monitoring instead. Surgery cures about 95% of cases when performed by an experienced surgeon.
Calcium levels usually drop to normal within hours after successful surgery. Some people experience temporary low calcium for a few days or weeks as their remaining glands adjust. Your doctor will monitor your levels closely and may prescribe calcium and vitamin D supplements during recovery.
Diet changes cannot cure primary hyperparathyroidism or stop PTH production. However, drinking plenty of water helps prevent kidney stones. Maintaining normal calcium intake is important, not restricting it. A balanced diet supports overall health while you decide on treatment options with your doctor.
Most people do not need lifelong medication after successful parathyroid surgery. Your remaining healthy glands usually take over and maintain normal calcium and PTH levels. Some people need temporary calcium and vitamin D supplements for a few weeks to months after surgery.
Blood tests measuring calcium and PTH together are very accurate for diagnosing primary hyperparathyroidism. Elevated or high-normal PTH with elevated calcium is diagnostic. Your doctor may repeat tests to confirm results. Vitamin D testing helps rule out other causes of elevated PTH.
Primary hyperparathyroidism does not directly cause weight gain. However, the fatigue and weakness it causes may reduce physical activity. Some people also experience changes in appetite. Weight changes are usually related to how symptoms affect your lifestyle rather than the condition itself.
Untreated primary hyperparathyroidism can lead to osteoporosis and fractures as calcium is pulled from bones. Kidney stones become more frequent and can damage kidneys over time. High calcium levels may cause kidney failure, heart rhythm problems, and stomach ulcers. These risks are why doctors recommend treatment for most cases.