Gynecomastia is the name for an excessive development of the breasts in males.

Gynecomastia affects an estimated 40 to 60 percent of men. It may affect only one breast or both. Though certain drugs and medical problems have been linked with male breast overdevelopment, in the vast majority of cases there is no known cause.

For men who feel self-conscious about their appearance, breast-reduction surgery can help. The procedure removes fat and or glandular tissue from the breasts and in extreme cases removes excess skin, resulting in a chest that is flatter and firmer.