Hyperparathyroidism

Overview

Hyperparathyroidism is a condition in which one or more of the parathyroid glands produce too much parathyroid hormone. The parathyroid glands are four small glands located in the neck, near the thyroid gland. Although they are close to the thyroid, they have a different function: they help control the level of calcium in the blood and bones.

Parathyroid hormone helps keep calcium in balance. When too much of this hormone is produced, calcium levels in the blood may become higher than normal, and calcium can be pulled from the bones. Over time, this may affect bones, kidneys, muscles, digestion, and general wellbeing.

There are different types of hyperparathyroidism. Primary hyperparathyroidism usually starts in the parathyroid glands themselves. Secondary hyperparathyroidism develops when another health problem, often related to kidney disease or low vitamin D, causes the glands to work harder. Tertiary hyperparathyroidism may occur after long-standing secondary hyperparathyroidism, when the glands remain overactive.

Symptoms

Some people with hyperparathyroidism have no noticeable symptoms, and the condition is found during routine blood tests. When symptoms occur, they can be mild and general, which means they may be mistaken for other health issues.

• Tiredness or low energy
• Muscle weakness or aches
• Bone or joint pain
• More frequent urination or increased thirst
• Kidney stones
• Constipation, nausea, or reduced appetite
• Abdominal discomfort
• Low mood, irritability, or difficulty concentrating
• Fragile bones or fractures in more advanced cases

The severity of symptoms does not always match the calcium level. Some people with only slightly raised calcium may feel unwell, while others with higher levels may have few symptoms.

Causes and Risk Factors

Primary hyperparathyroidism is most often caused by a non-cancerous enlargement or growth in one parathyroid gland. Less commonly, more than one gland may be enlarged. Very rarely, it may be related to parathyroid cancer.

Secondary hyperparathyroidism happens when the body has difficulty maintaining normal calcium levels, causing the parathyroid glands to produce more hormone. Common contributing factors include chronic kidney disease, low vitamin D, and problems with calcium absorption.

Risk factors may include being older, having a personal or family history of parathyroid or endocrine conditions, previous radiation treatment to the neck area, certain inherited syndromes, kidney disease, or long-term low vitamin D. Some medicines and medical conditions can also influence calcium balance, so a healthcare professional will consider the full medical history.

Diagnosis

Hyperparathyroidism is usually diagnosed through blood tests. These tests commonly check calcium and parathyroid hormone levels. Additional blood tests may assess vitamin D, kidney function, phosphate, and other minerals that help show how the body is handling calcium.

Urine tests may be used to measure calcium loss through the kidneys and to help distinguish hyperparathyroidism from other conditions that can cause high calcium levels. If kidney stones are suspected, imaging may be recommended.

Bone density testing may be performed to evaluate whether the bones have been affected. Imaging of the parathyroid glands, such as ultrasound or specialized scans, may be used after the diagnosis is established, especially if surgery is being considered. Imaging is typically used to locate the overactive gland rather than to make the diagnosis by itself.

Because symptoms can be general, it is important that diagnosis is based on medical evaluation and laboratory findings rather than symptoms alone.

Treatment Options

Treatment depends on the type of hyperparathyroidism, calcium level, symptoms, kidney function, bone health, age, and overall medical condition. The care plan is individualized after assessment by an endocrinology specialist or another qualified healthcare professional.

For primary hyperparathyroidism, surgery to remove the overactive parathyroid gland or glands may be recommended in certain cases. This is a common treatment option when there are symptoms, kidney stones, reduced bone density, significant calcium elevation, or other medical concerns. The surgical approach depends on the number and location of affected glands.

In mild cases without symptoms or organ effects, careful monitoring may be appropriate. Monitoring can include periodic blood tests, kidney assessment, and bone density evaluation. Patients may also receive guidance on hydration, diet, physical activity, and avoiding factors that could worsen calcium imbalance, but recommendations should be personalized.

For secondary hyperparathyroidism, treatment focuses on the underlying cause, such as kidney disease, vitamin D imbalance, or calcium absorption problems. Management may involve nutritional assessment, correction of deficiencies, and specialist care for kidney or digestive conditions when relevant.

In all forms of hyperparathyroidism, the goal is to protect bone strength, reduce kidney-related complications, and maintain calcium balance as safely as possible.

When to See a Doctor

It is advisable to see a doctor if blood tests show high calcium, abnormal parathyroid hormone levels, or unexplained changes in kidney or bone health. Medical review is also important if you have recurrent kidney stones, unexplained fractures, persistent bone pain, muscle weakness, unusual tiredness, increased thirst, or frequent urination.

Seek prompt medical attention if symptoms are severe, such as marked weakness, confusion, dehydration, severe abdominal pain, repeated vomiting, or a sudden change in alertness. These symptoms may be related to a significant calcium imbalance or another urgent medical condition.

People with chronic kidney disease, a history of endocrine disorders, or a family history of parathyroid problems may benefit from regular follow-up. Early evaluation can help identify calcium and hormone changes before complications develop.