Gynecomastia means excess growth of the breast tissue in men. It is a rather common condition: as many as 40-60 % of men are estimated to be affected by it. Gynecomastia can cause either one or both breasts to enlarge, and it can be linked to certain medicines and medical problems. It is a purely cosmetic and often embarrassing condition, but depending on the symptoms, breast reduction surgery can also be done for medical reasons. During the procedure, excessive skin and fat and/or breast tissue is removed, and the contours of the chest are improved.