A condition where there is elevated blood levels of the hormone Prolactin. This hormone is secreted by the pituitary gland. There are several diseases that can result in abnormally high Prolactin levels. Most commonly, this is due to a small and benign Prolactin secreting tumor in the pituitary gland called Prolactinoma. Often this can result from an abnormally slow functioning thyroid gland. The treatment is specific to the cause, but medical management with Bromocriptine (Parlodel) is the first line of therapy.