The most common genetic disorders resulting in hyperparathyroidism include multiple endocrine neoplasia type 1 (Wermer’s syndrome, MEN1) and type 2A (MEN2A), hyperparathyroidism–jaw tumor (HPT-JT) syndrome, familial isolated hyperparathyroidism (FIHP). Here, MEN1 is linked to multiple endocrine neoplasia type 1.