Postsurgical (75%-80%)

Autoimmune (20%-25%)

Autoimmune polyglandular syndrome-1

Isolated autoimmune hypoparathyroidism

Genetic

Syndromic: DiGeorge syndrome, CHARGE

Nonsyndromic: Autosomal dominant hypocalcemia type 1

Infiltrative

Granulomatous: Amyloidosis, sarcoidosis

Metastatic cancer

Hemochromatosis

Wilson disease

Radiation

Burn injury

Functional hypoparathyroidism

Hypermagnesemia

Hypomagnesemia

Maternal hyperparathyroidism

Idiopathic hyperparathyroidism