Hyperprolactinemia is characterized by too much prolactin in the blood. Prolactin is a hormone made in the body by the pituitary gland which is a small organ at the base of the brain that works to help our body regulate growth, reproduction, lactation and stress. In women, increased levels of prolactin in the blood causes milk production and secretion from the breasts without associated childbirth or nursing (galctorrhea), the absence of a regular menstrual period (amenorrhea) and infertility. Though it is most often seen in femles, it can sometimes be seen in males. Males with hyperprolactinemia often have impaired sexual function and in rare cases can have milk secretion (galactorrhea). Higher than normal levels of prolactin can be caused by normal changes during pregnancy and nursing which is expected. However hyperprolactinemia can also be caused by prolonged stress, side effects of certain medications, or disease or tumors of the pituitary gland (sometimes called Forbes Albright syndrome). This condition can be diagnosed by measuring prolactin levels in the blood or by X-rays or MRI of the area surrounding the pituitary gland. Treatment typically includes medications to help reduce the amount of prolactin in the body. These are successful in the majority of patients though close follow up monitoring is needed due to recurrence. Surgery may be necessary if tumor does not respond to treatment with medications. Because high levels of prolactin and reduced or absent menstrual cycles also increases a woman's risk for osteoporosis (weak, brittle bones), it is important to follow up with your doctor in this regard.