DefinitionBy Mayo Clinic staff
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Hypercalcemia is a condition in which the calcium level in your blood is above normal. You need calcium to maintain your bones. It also plays an important role in contracting muscles, releasing hormones and ensuring that your nerves and brain function properly. High calcium levels, however, can interfere with these processes.
The main cause of hypercalcemia is overactivity in one or more of your parathyroid glands, which regulate blood calcium levels. Other causes of hypercalcemia include cancer, certain other medical disorders, some medications and excessive use of calcium and vitamin D supplements.
Signs and symptoms of hypercalcemia may range from nonexistent to severe. Treatment depends on the underlying cause.
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