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A prolactinoma is a benign-noncancerous-tumor of the pituitary gland that produces a hormone called prolactin. Prolactinomas are the most common type of pituitary tumor. Symptoms of prolactinoma are caused by hyperprolactinemia-too much prolactin in the blood-or by pressure of the tumor on surrounding tissues.

Prolactin stimulates the breast to produce milk during pregnancy. After giving birth, a mother’s prolactin levels fall unless she breastfeeds her infant. Each time the baby nurses, prolactin levels rise to maintain milk production.

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