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Overview
Hyperparathyroidism Overview
Hyperparathyroidism occurs when one or more of the four parathyroid glands make too much parathyroid hormone. This hormone helps control calcium levels, and excess production can raise the amount of calcium in the blood. Some people have no symptoms, while others develop effects involving the bones, kidneys, digestion, or mood. Primary hyperparathyroidism and secondary hyperparathyroidism have different causes and require different evaluations.
The role of the parathyroid glands
The parathyroid glands are four small glands usually located behind the thyroid gland in the neck; they are separate from the thyroid and are not caused by thyroid disease. Parathyroid hormone raises blood calcium when needed by releasing calcium from bone, helping the kidneys retain calcium, and supporting vitamin D activation so the intestines can absorb calcium. It also helps maintain the balance between calcium and phosphorus.
Symptoms
Symptoms of Hyperparathyroidism
Mild hyperparathyroidism may cause no noticeable symptoms, or it may cause general symptoms that can have many explanations. When symptoms occur, they often relate to high calcium levels or long-term effects on the bones and kidneys. Many people learn they have hyperparathyroidism after routine blood tests rather than because of a specific symptom.
- Fatigue and low energy can occur, even when calcium elevation is mild.
- Weakness may affect everyday activities or exercise tolerance.
- Bone or joint pain can develop as calcium is drawn from bone.
- Constipation, nausea, or reduced appetite may occur with high calcium.
- Increased thirst and more frequent urination can be signs of elevated calcium.
- Kidney stones may cause severe pain in the side, back, or groin.
- Mood or concentration changes can include irritability, depression, or difficulty thinking clearly.
- Reduced bone density can increase the risk of fractures.
Seek urgent care
Warning signs
Sudden severe confusion, repeated vomiting, dehydration, marked weakness, or loss of consciousness may indicate dangerously high calcium. Seek urgent medical care if these symptoms occur.
Causes
Causes of Hyperparathyroidism
| Type | Typical cause | Calcium pattern | What happens |
|---|---|---|---|
| Primary | An adenoma or enlargement of one or more parathyroid glands | Usually high | The gland produces excess hormone without an underlying calcium shortage. |
| Secondary | Chronic kidney disease, vitamin D deficiency, or poor calcium absorption | Usually normal or low | The glands respond to another problem by producing more hormone. |
| Tertiary | Longstanding secondary hyperparathyroidism, often related to kidney disease | Often high | The glands remain overactive even after the original stimulation has changed. |
Primary hyperparathyroidism most often results from a noncancerous parathyroid adenoma, or from enlargement of more than one gland. Rare causes include inherited syndromes such as multiple endocrine neoplasia and, very rarely, parathyroid cancer.
Secondary hyperparathyroidism is usually a compensatory response to chronic kidney disease, vitamin D deficiency, or impaired absorption of calcium. Tertiary hyperparathyroidism can develop when the glands have been stimulated for a long time, particularly in people with longstanding kidney disease, and continue making excess hormone.
Risk Factors
Risk Factors for Hyperparathyroidism
- Older age is associated with a higher likelihood of developing primary hyperparathyroidism.
- People assigned female at birth are diagnosed with primary hyperparathyroidism more often than people assigned male at birth.
- A family history of hyperparathyroidism can increase risk.
- Inherited conditions such as multiple endocrine neoplasia can affect the parathyroid glands.
- Chronic kidney disease can cause secondary hyperparathyroidism.
- Vitamin D deficiency can stimulate excess parathyroid hormone production.
- Malabsorption conditions or intestinal surgery can reduce calcium and vitamin D absorption.
- Previous radiation treatment to the neck may increase the risk of parathyroid abnormalities.
- Long-term use of some medicines that affect calcium balance may contribute to abnormal hormone levels.
Complications
Complications of Hyperparathyroidism
- Osteoporosis or reduced bone density can make bones weaker and more likely to fracture.
- Kidney stones may form when excess calcium is filtered into the urine.
- Long-term disease or severe calcium abnormalities can reduce kidney function.
- Severe or persistent calcium elevation may affect the cardiovascular system.
- Severe hypercalcemia can cause dehydration, confusion, vomiting, and profound weakness.
Complication risk depends on the type and severity of hyperparathyroidism, calcium levels, how long the condition has been present, kidney health, bone strength, and whether treatment is started. Regular follow-up can help identify bone or kidney effects before they become more serious.
Urgent warning
Possible calcium emergency
Severe hypercalcemia with confusion, dehydration, persistent vomiting, or extreme weakness is a medical emergency. Seek immediate evaluation rather than waiting for a routine appointment.
Diagnosis
How Hyperparathyroidism Is Diagnosed
Diagnosis usually begins with repeated blood tests for calcium and parathyroid hormone. Clinicians interpret these results with albumin or ionized calcium, phosphate, kidney function, and vitamin D levels to identify the pattern and possible cause. A single abnormal result may need to be confirmed because calcium and hormone levels can vary.
- A 24-hour urine calcium test helps assess how much calcium the kidneys are excreting and can help distinguish related conditions.
- A bone density scan checks for osteoporosis or reduced bone strength.
- Kidney imaging can look for kidney stones or other effects of high calcium.
- Neck imaging may help locate an abnormal gland when parathyroid surgery is being considered.
Treatment & Management
Hyperparathyroidism Treatment and Management
Hyperparathyroidism treatment depends on whether the condition is primary, secondary, or tertiary and whether there are symptoms or complications. Clinicians consider high calcium, kidney stones, bone loss, reduced kidney function, overall health, and the likely cause when recommending monitoring, medicines, treatment of an underlying condition, or surgery.
| Approach | When it may be used | What it involves | Monitoring or cautions |
|---|---|---|---|
| Active monitoring | Mild primary disease without major symptoms or complications | Regular assessment of calcium, kidney function, symptoms, and bone health | Follow-up is important because calcium, bones, or kidneys may change over time. |
| Treat contributing conditions | Secondary hyperparathyroidism caused by kidney disease, vitamin D deficiency, or malabsorption | Managing the underlying condition and correcting nutrient or mineral problems safely | Treatment should be guided by laboratory results and kidney function. |
| Medicines | When surgery is unsuitable, symptoms need control, or secondary disease requires medication | Medicines may lower calcium or reduce the effects of excess hormone, depending on the cause | Possible benefits and side effects require clinician-supervised follow-up. |
| Parathyroidectomy | Selected primary or tertiary disease, especially with significant symptoms or bone, kidney, or calcium complications | Surgical removal of the overactive gland or glands | Calcium and parathyroid hormone levels need monitoring after surgery. |
- Maintain appropriate hydration unless a clinician has prescribed fluid restrictions.
- Avoid excessive calcium or vitamin D supplements unless they are specifically prescribed.
- Address vitamin D deficiency safely with guidance from a clinician.
- Protect bone health through recommended physical activity, nutrition, and fall prevention.
- Keep scheduled blood, kidney, and bone monitoring appointments.
Outlook and Prognosis
Outlook and Prognosis
Many people with hyperparathyroidism do well when the underlying cause is treated or the condition is appropriately monitored. Long-term outlook depends on calcium levels, kidney function, bone health, disease type, how long it has been present, and response to treatment.
Successful surgery for appropriate primary or tertiary disease can normalize parathyroid hormone levels. Calcium and parathyroid hormone may still need follow-up afterward, and recovery of bone strength can take time.
When Should You See a Doctor
When Should You See a Doctor?
- Arrange a medical appointment for persistent thirst or frequent urination.
- Ask for evaluation if you have recurrent kidney stones.
- Discuss unexplained fractures or ongoing bone pain with a clinician.
- Seek evaluation for fatigue or constipation when blood tests show abnormal calcium.
- Contact a clinician if testing shows high calcium or parathyroid hormone.
Get urgent help
Emergency symptoms
Go to emergency care for severe confusion, fainting, severe dehydration, repeated vomiting, profound weakness, or other sudden symptoms that could reflect dangerously high calcium.
Branches
1 topic
Hyperparathyroidism
Endocrinology & Metabolic Diseases
