Gynecomastia is the name given to abnormal but benign growth in the amount of breast tissue in men due to an imbalance of estrogen and testosterone hormones. Gynecomastia can affect one breast in some cases, and both breasts in some cases. Both breasts can be affected irregularly and reach different sizes. Newborns, adolescent boys, and older men can develop gynecomastia as a result of normal changes in hormone levels. However, there are other reasons for the development of gynecomastia. Gynecomastia is not a serious problem in many cases, but it can be difficult for individuals to cope with it. Cases have been observed in men with gynecomastia where they feel pain in their breasts. In some cases, the individual may feel embarrassed about the condition. Depending on the cause of gynecomastia, it can heal on its own in some patients, while drug therapy or surgery may be necessary to solve the problem in others.