Hypercalcemia is too much calcium in the blood.

Hypercalcemia is a relatively frequent medical problem.

Its causes include increased intake (excess vitamin D or vitamin A, excess calcium intake), endocrine disorders (primary hyperparathyroidism, adrenal gland insufficiency), cancer (including multiple myeloma), and other causes (thiazide-diuretics, sarcoidosis, Paget's disease of bone).

Mild hypercalcemia is often asymptomatic. Excessive urination and constipation are common. In more severe cases,...