Gynecomasty is an increase in the amount of breast gland tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. Gynecomasty can affect one or both breasts, sometimes unevenly.Newborns, boys going through puberty and older men may develop gynecomastia as a result of normal changes in hormone levels, though other causes also exist.
Generally, gynecomasty isn't a serious problem, but it can be tough to cope with the condition. Men and boys with gynecomasty sometimes have pain in their breasts and may feel embarrassed.
Gynecomasty may go away on its own. If it persists, medication or surgery may help.