Hereditary disorders associated with hypercalcemia include familial isolated primary hyperparathyroidism (FIHP), familial benign hypocalciuric hypercalcemia (FBHH), multiple endocrine neoplasia type 1 (MEN1), MEN type 2 (MEN2), and the hyperparathyroidism–jaw tumor (HPT-JT) syndrome. This evidence concerns the gene MEN1 and familial hypocalciuric hypercalcemia.