Hypoparathyroidism is an endocrine disorder in which the parathyroid glands in the neck do not produce enough parathyroid hormone (PTH). The parathyroid gland helps control calcium use and removal by the body. They do this by producing parathyroid hormone which helps control calcium, phosphorus, and vitamin D levels within the blood and bone. The most common cause of hypoparathyroidism is injury to the parathyroid glands during head and neck surgery. Symptoms are many and include abdominal pain, brittle nails, cataracts, dry hair, dry and scaly skin, muscle cramps, muscle spasms, pain in the face, legs, and feet, seizures, tingling lips, fingers, and toes, decreased consciousness, hand or foot spasms, and painful menstruation.
Hypoparathyroidism, Mayo Clinic (Mar. 9, 2018), https://www.mayoclinic.org/diseases-conditions/hypoparathyroidism/symptoms-causes/syc-20355375