It is a condition in which breast tissue forms in guys and usually due to hormonal changes during puberty. Hormones are chemicals produced by your body glands. Guys have mostly androgen in their system but they have small amount of estrogen as well. In girl, breast develops due to high level of estrogen. But sometimes guys during puberty produce enough estrogen that some breast tissue develops. It can happen on one side or both side of chest and feel tender. Sometimes it is called male breast or puffy nipple or man boob.
Almost half of all males going through puberty develop some degree of gynaecomastia. It is a temporary condition. But some guys with gynecomastia feel embarrassed as self conscious about their appearance, wearing tight shirts sometimes difficult. more...