Skip to content
My WebMD Sign In, Sign Up

Men's Health

Font Size

Gynecomastia - Topic Overview

What is gynecomastia?

Gynecomastia is overdevelopment of the male breast. In response to too much estrogen (a female hormone) or too little testosterone (a male hormone), the glandular tissue of the breast swells and forms a breast bud (enlarged breast). Gynecomastia can occur in babies, teen boys, and older men.

What causes gynecomastia?

In newborns, gynecomastia is caused by estrogen from the mother. Breast buds are common in baby boys. Breast buds tend to go away gradually by 6 months of age, but they can last longer in some babies.

In preteen boys, gynecomastia can also be caused by an estrogen-producing tumor. Breast buds are common during puberty. The buds may last up to 2 years, but they tend to go away within the first year.

In teen boys, gynecomastia is caused by the hormonal changes of puberty. Gynecomastia occurs in many boys during early puberty to middle puberty. It usually goes away within 6 months to 2 years.

In adult males, gynecomastia is usually caused by another condition, such as liver or lung cancer, cirrhosis of the liver, overactive thyroid, or by hormone problems, such as cancer of the pituitary gland, adrenal glands, or testicles. Alcohol, marijuana, methamphetamine, and heroin use also may cause gynecomastia.

Use of certain medicines may also cause gynecomastia, including:

What are the symptoms?

In addition to having enlarged breasts, men or boys with gynecomastia may notice their breasts feel rubbery or firm. Boys may have a breast bud on one or both sides about the size of a nickel or quarter. Breast buds are common in adolescent boys during puberty. They may last up to 2 years, but they tend to go away within the first year.

How is gynecomastia diagnosed?

Gynecomastia can usually be diagnosed from a physical examination and medical history. In most cases, tests are not necessary. But if the breast lump is unusually large, one-sided, tender, or hard and fixed, a biopsy may be done to rule out other problems.

Any man who finds a one-sided breast lump should let his doctor know if he has close relatives who have had breast cancer (mother, sister, or daughter). If there is any concern about cancer, a lump can be checked with a biopsy or surgery.

How is it treated?

Gynecomastia in babies and teens normally does not require treatment and will usually go away on its own. If it is caused by medicine or disease, stopping the medicine or treating the disease will often cure the gynecomastia. If it is caused by a lack of testosterone and increase in estrogen, hormonal treatment may be prescribed.

1

WebMD Medical Reference from Healthwise

Last Updated: October 24, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Today on WebMD

Life Cycle of a Penis
Slideshow
Preacher Curl
Slideshow
 
testosterone molecule
Article
Xray of foot highlighting gout
Slideshow
 
Food Men 10 Foods Boost Male Health
Slideshow
Thoughtful man sitting on bed
Quiz
 
Man taking blood pressure
Slideshow
doctor holding syringe
Slideshow
 
Condom Quiz
Quiz
thumbnail_angry_couple_in_bed
Slideshow
 
man running
Quiz
woman holding hand to ear
Slideshow