About the Parathyroid Glands

The parathyroid glands are four small glands located in the neck near the thyroid gland. These glands control the calcium and phosphorous levels in the blood through the production of parathyroid hormone. Normally, the parathyroid hormone is produced when the calcium levels in the blood drops too low. This causes the bones to release calcium, the intestines absorb more calcium, and the kidneys decrease the amount of calcium excreted in the urine, thereby increasing the calcium level in the blood. When the intestines and kidneys do not take enough calcium from the bloodstream, and the bones are depleted of calcium, the calcium level in the blood is too high.