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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....
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Gynecomastia symptoms can include:
See a member of your health care team if you have:
In people assigned male at birth, the body mainly makes the sex hormone testosterone. It also makes small amounts of the hormone estrogen. Gynecomastia can happen when the amount of testosterone in the body drops compared with estrogen. The decrease can be caused by conditions that lower testosterone or block its effects. Or it can be caused by conditions that raise the estrogen level.
Some things that can change the body's hormone balance include the following:...
Gynecomastia often goes away over time without treatment. But if gynecomastia is caused by a medical condition, that condition may need treatment.
If you take medicine that may be the cause of gynecomastia, ask your health care team about your choices. Your doctor may have you stop the medicine or try a different one.
Often, no treatment is needed for teenagers who have gynecomastia due to natural hormone changes during puberty. A teen's health care team may recommend checkups every 3 to 6 mont...
Several factors within your control may lower the risk of gynecomastia:
For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.
© Mayo Clinic
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