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Definition
By Mayo Clinic staffGalactorrhea is a milky nipple discharge unrelated to the normal milk production of breast-feeding. Galactorrhea itself isn't a disease, but it's a sign of an underlying problem. Although it occurs most often in women, galactorrhea can happen in men and even sometimes in infants.
Excessive breast stimulation, medication side effects, or disorders of the hypothalamus or pituitary glands all may contribute to galactorrhea. Often, galactorrhea results from increased levels of prolactin, the hormone that stimulates milk production.
Sometimes, the cause of galactorrhea can't be determined, and the condition goes away on its own.
