Hypoparathyroidism is a rare condition in which your body secretes abnormally low levels of parathyroid hormone (parathormone). This hormone plays a key role in regulating and maintaining a balance of your body's levels of two minerals: calcium and phosphorus. The low production of parathyroid hormone in hypoparathyroidism leads to abnormally low ionized calcium levels in your blood and bones and to an increased amount of phosphorus. Treatment for hypoparathyroidism consists of taking supplements to normalize your levels of calcium and phosphorus. Because hypoparathyroidism is a chronic condition, treatment is generally lifelong. Relative or absolute deficiency in PTH action resulting in hypocalcemia may present with paresthesias, muscle spasm, and ECG changes. By far the most common cause of the disease in adults is damage to the parathyroid during neck surgery. If the condition does not cause clinically significant hypocalcemia, hypoparathyroidism may be entirely asymptomatic.