Doctors estimate that one in ten people will have a kidney stone during their lifetime. It is one of the most painful experiences. The parathyroid gland controls levels of calcium in the blood. The Norman Parathyroid Center is the world's leading experts on calcium and kidney stones. The Center states, "Hyperparathyroidism (high calcium levels) is the number one cause of kidney stones and thus every person with a kidney stone must be tested for a problem with their parathyroid glands. Nearly half of all people with kidney stones have a benign parathyroid tumor in their neck that must be removed or the kidney stones will return."