Alternative Names
Breast development in a male
Definition of Gynecomastia:
Gynecomastia is the development of abnormally large breasts in males.
Considerations:
The condition may occur in one or both breasts and begins as a small lump beneath the nipple, which may be tender. The breasts often enlarge unevenly. Gynecomastia during puberty is not uncommon and usually goes away over a period of months.
In newborns, breast development may be associated with milk flow (galactorrhea). This condition usually lasts for a couple of weeks, but in rare cases may last until the child is 2 years old.
Common Causes:
The most common cause of gynecomastia is puberty.
Other causes include:
- Chronic liver disease
- Exposure to anabolic steroid hormones
- Exposure to estrogen hormone
- Genetic disorders
- Kidney failure
- Marijuana use
- Side effects of some medications
- Testosterone (male hormone) deficiency
Rare causes include:
