Although rarely discussed, enlargement of the male breast is a common condition. Gynecomastia affects approximately 40 to 60 percent of men at some point in their lives. There is often no known cause for gynecomastia, although there has been some correlation with various drugs or medical conditions. Most breast enlargement occurs during puberty and usually resolves in a year. Men who feel self-conscious about their appearance are helped with breast-reduction surgery. The procedure removes fat and/or glandular tissue from the breasts, and in extreme cases removes excess skin, resulting in a contoured chest that is flatter and firmer.