is a common condition in men and boys. The breasts swell and become abnormally large. All men and women have breast glands, but they are not noticeable in men, because they tend to be small and undeveloped.
Breast gland enlargement in males may affect newborns, boys during puberty, and older men.
By adulthood, 90 percent of cases are resolved. Later in life, the incidence increases again with age.
Gynecomastia does not mean that someone has extra fat from being overweight. It is caused by additional breast tissue. Doing exercise or losing weight will not reduce the breast tissue in gynecomastia.
Pseudogynecomastia is separate condition, where fat builds up in the breasts, possibly due to being overweight or obese.