The parathyroid glands are four pea-sized glands located on the thyroid gland in the neck. Occasionally, a person is born with one or more of the parathyroid glands embedded in the thyroid, in the thymus, or located elsewhere around this area. In most such cases, however, the glands function normally.
Though their names are similar, the thyroid and parathyroid glands are different glands. Each makes distinct hormones with specific functions. The parathyroid glands secrete parathyroid hormone (PTH), a substance that helps maintain the correct balance of calcium and phosphorus in the body. PTH regulates the level of calcium in the blood, release of calcium from bone, absorption of calcium in the intestine, and excretion of calcium in the urine.
When the level of calcium in the blood falls too low, the parathyroid glands secrete just enough PTH to restore the blood calcium level.
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Read the Original Article: Hyperparathyroidism