Hyperactivity of the parathyroid glands is a common disorder, occurring in approximately 1 out of every 200 women over the age of 50. The pages on the sub-menu of this page provide a basic overview of the more common parathyroid disorders. To access websites with more detailed information about the parathyroid disorders, please view our “Links” page where reputable websites are listed, including the Patient Education Site of the American Association of Endocrine Surgeons (AAES), an unbiased site created by parathyroid experts from around the United States (all of whom are members of the AAES).