Hyperprolactinemia is a condition in which there are unusually high prolactin levels in one’s blood. People who have this condition may also have prolactinomas (benign, or harmless, tumors or growths on the pituitary gland).
Prolactin is a hormone that is necessary for breast milk production. It is made in the pituitary gland (a small gland at the base of the brain). Additionally, prolactin can affect levels of estrogen and testosterone in the body. Very high prolactin levels lead to low levels of estrogen and testosterone.
There are many causes of hyperprolactinemia, including: