Prolactin is a hormone released by the pituitary gland necessary for the normal production of breast milk. Men also produce prolactin, but scientists do not know why or what its function is in men. Low blood levels are seen in people with pituitary gland dysfunction or cancer; high blood levels are seen in people with anorexia, severe stress, trauma, illness, absence of normal menstrual periods, kidney failure, an under-active thyroid gland, or cancer. There are many medications that can affect prolactin levels.
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