Gynecomastia
Alternate Names : Breast Development in a Male
Definition The development of prominent breast tissue in the male.
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Overview & Considerations
The most common cause of gynecomastia in the male is puberty. The condition may occur in one or both breasts and begins as a small lump beneath the nipple, which may be tender. The breasts often enlarge unevenly. Gynecomastia during puberty is not uncommon, is self-limiting, and usually goes away over a period of months.
In newborns, breast development may be associated with milk flow (galactorrhea). This condition usually lasts for a couple of weeks and in rare cases may persist until the child is two years old. It is caused by exposure to maternal hormones.
Other causes of gynecomastia include chronic liver disease, kidney failure, and exposure to estrogens, androgens (often taken secretly for body building). marijuana, and some medications. Rare causes include tumors, genetic defects, and an overactive thyroid.
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