Parathyroid gland is located on each side of the neck on the thyroid gland.
The parathyroid glands, which lie behind the thyroid, manufacture the parathyroid hormone, which plays a role in regulating your body's levels of the minerals calcium and phosphorus. Hyperparathyroidism is when your parathyroid glands create too much parathyroid hormone in the bloodstream.
You can easily live with one (or even 1/2) parathyroid gland. Removing all 4 parathyroid glands will cause very bad symptoms of too little calcium (hypOparathyroidism).Parathyroid disorders lead to abnormal levels of calcium in the blood that can cause brittle bones, kidney stones, fatigue, weakness, and other problems.