- XBODY UK
What is gynecomastia or man boobs? Enlarged breast in men, also called gynecomastia, is swelling of the breast tissue caused by an imbalance of the hormones estrogen and testosterone. One or both breasts can be affected, sometimes unevenly. Boys in puberty and older men can sometimes develop gynecomastia due to normal changes in hormone levels. Seventy percent of boys get it during puberty. Middle-aged and older men can experience...