Diane W. Shannon, MD, MPH
Gynecomastia is an enlargement of the breasts in men. This condition is not the same as having a fatty breast area from obesity. The breast tissue is firm in men with gynecomastia.
This may occur in up to one-third of men. About 65% of boys will develop some degree of breast enlargement during puberty. This is normal and usually goes away by age 18.
All men produce male and female hormones. Normally, men produce much more male hormones than female hormones. Gynecomastia is caused by an imbalance in the female and male hormones. The hormone imbalance can be caused by:
Factors that increase your chance of getting gynecomastia include:
Symptoms of gynecomastia include:
Your doctor will ask about your symptoms and medical history. A physical exam will be done. Your doctor will focus on your weight, breast exam, testicular exam, and any other signs of a hormone problem. You may be referred to a doctor who specializes in hormone disorders.
Other tests may be done if you have prolonged or large gynecomastia.
Your bodily fluids and tissues may be tested. This can be done with:
Images may be taken of your chest. This can be done with:
Treatment for gynecomastia is rarely needed. However, it is important to find and treat the underlying cause of the gynecomastia. If a medication is causing gynecomastia, your doctor will ask you to stop taking it or to switch medication. If a tumor is causing the problem, your doctor will make a treatment plan for the tumor.
Medications may be used if needed to treat the gynecomastia. However, they can produce unwanted side effects. Surgery may also be used to remove breast tissue.
Some gynecomastia may be prevented by avoiding known risk factors. This includes avoiding:
American Academy of Family Physicians
American Academy of Pediatrics
Men's Health Centre
Gynecomastia. EBSCO DynaMed website. Available at:
http://www.ebscohost.com/dynamed/what.php. Updated April 19, 2013. Accessed July 18, 2013.
Gynecomastia: when breasts form in males. American Academy of Family Physicians website. Available at:
http://familydoctor.org/online/famdocen/home/men/general/080.html. Updated December 2010. Accessed July 18, 2013.
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Last reviewed July 2013 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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