Hyperparathyroidism is a condition in which your body produces too much parathyroid hormone. This hormone helps maintain the proper levels of calcium and phosphorus in your body. The parathyroid hormone is manufactured by the small oval-shaped parathyroid glands in your neck, adjacent to your thyroid gland. Each of your four parathyroid glands is about the size of a grain of rice. 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 as a thermostat controls a heating system to maintain a constant air temperature. |