The sole purpose of the parathyroid glands is to regulate the calcium level in our bodies within a very narrow range so that the nervous and muscular systems can function properly. Although they are neighbors and both part of the endocrine system, the thyroid and parathyroid glands are otherwise unrelated. The single major disease of parathyroid glands is overactivity of one or more of the parathyroids; that's hyperparathyroidism.
To make information about parathyroid disorders more understandable, we have separated our parathyroid pages into specific topics. Once you read about a topic, more detailed information is available if you want it.