Gynecomastia (guy-nuh-koh-MAS-tee-uh) is an increase in the amount of breast gland tissue in boys or men. An imbalance of the hormones estrogen and testosterone causes it. Gynecomastia can affect one or both breasts, sometimes unevenly.
Pseudogynecomastia is an increase in fat but not gland tissue in male breasts. Newborns, boys going through puberty and older men may develop gynecomastia due to natural changes in hormone levels. There are other causes too.
Most often, gynecomastia isn't a serious problem. But it can be tough to cope with the condition. People with gynecomastia sometimes have pain in their breasts. And they may feel embarrassed.

Gynecomastia may go away on its own. If it doesn’t, medicine or surgery may help.


Gynecomastia symptoms can include:

  • Pain, especially in teenagers.
  • Swollen breast tissue.
  • Tender breasts.
  • Sensitive nipples when they rub against clothes.

When to see a doctor

See a member of your health care team if you have:

  • Swelling.
  • Pain or tenderness.
  • Fluid coming out of one or both breast nipples. This is called nipple discharge.
  • A firm or hard lump.
  • Dimpled skin on the breast.


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