Hyperparathyroidism

**Definition:** Hyperparathyroidism refers to overproduction of parathormone and is most frequently due to a tumour in one of the parathyroid glands. It may also occur in response to low calcium levels, as encountered in various situations such as vitamin D deficiency or chronic kidney disease. Hyperparathyroidism results in weakening of the bones through loss of calcium.

**Exclusions:** - Adult osteomalacia - infantile and juvenile osteomalacia