Gynecomastia
Definition
Gynecomastia is the development of abnormally large breasts in males.
Alternative Names
Breast development in a maleConsiderations
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.
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:
- Genetic defects
- Overactive thyroid
- Tumors
A.D.A.M., Inc. is accredited by
URAC, also known as the American
Accreditation HealthCare Commission. URAC's accreditation program is
the first of its kind, requiring compliance with 53 standards of quality and
accountability, verified by independent audit.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2005 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.