This leads to abnormally high calcium levels and low phosphorus levels in your blood.Ĭalcium is best known for its role in keeping your teeth and bones healthy. But sometimes one or more of these glands produce too much hormone. When blood-calcium levels are too high, the parathyroid glands produce less PTH. PTH raises calcium levels by releasing calcium from your bones and increasing the amount of calcium absorbed from your small intestine. When calcium levels in your blood fall too low, your parathyroid glands secrete enough PTH to restore the balance.
Vitamin D also is involved in regulating the amount of calcium in your blood. The parathyroid glands maintain proper levels of both calcium and phosphorus in your body by turning the secretion of parathyroid hormone (PTH) off or on, much like a thermostat controls a heating system to maintain a constant air temperature. Hyperparathyroidism is caused by factors that increase the production of parathyroid hormone. Request an Appointment at Mayo Clinic Causes