What is gynecomastia?
Gynecomastia is a condition of overdevelopment or enlargement of the breast tissue
in children and adults who have a penis. The breasts become larger. They may grow
Gynecomastia often happens when a preteen or teenage child is going through the hormonal
changes of puberty. But it can also happen to newborn babies and to adults as they
What causes gynecomastia?
Gynecomastia is usually a benign (noncancerous) condition. It may be linked to many
different causes of hormone changes. In many cases, the cause isn’t known.
Gynecomastia is often caused by changes in levels of the hormones estrogen and testosterone.
But it can be caused by other things as well.
Gynecomastia can be a side effect of certain medicines, such as antidepressants, antibiotics,
chemotherapy, prostate cancer medicines, or ulcer or cardiovascular medicines. Illegal
drugs, such as anabolic steroids, heroin, or marijuana can also cause gynecomastia.
Some diseases and health conditions may also cause gynecomastia. These include:
Newborn babies may have a short-term form of gynecomastia. This is often because the
birth parent's estrogen stays in a baby’s blood for a while after birth.
Gynecomastia is not linked to breast cancer. It's rare that people with a penis get
breast cancer. But your healthcare provider may do some tests and examine you to rule
out breast cancer.
What are the symptoms of gynecomastia?
You may have gynecomastia in one or both breasts. It may start as a lump or fatty
tissue beneath the nipple, which may be sore. The breasts often get larger unevenly.
The symptoms of gynecomastia may look like other health conditions or problems. Always
see your healthcare provider for a diagnosis.
How is gynecomastia diagnosed?
Your healthcare provider will take your past health and medicine history and give
you a physical exam.
To rule out other diseases or conditions, you may also have tests, including:
Blood tests, including liver function tests and hormone studies
A low-dose X-ray of your breast (mammogram)
A small breast tissue sample (a biopsy) may be removed and checked for cancer cells
In some cases, tests are not needed to diagnose the condition.
Your healthcare provider may suggest that you see a healthcare provider (endocrinologist)
who specializes in hormones and how they affect many organs.
How is gynecomastia treated?
Treatment will depend on your symptoms, age, and general health. It will also depend
on how severe the condition is.
Most cases of gynecomastia happen during puberty. The condition usually gets better
on its own without treatment. This may take from 6 months to 2 or 3 years.
If a medicine is causing your breast enlargement, you may need to stop taking the
medicine. That can solve the problem. If a disease is causing the condition, the disease
will need to be treated. If these problems are not addressed, the condition can come
back after it is treated.
Hormone therapy may be used to treat gynecomastia.
In rare cases, surgery may be used to remove the extra tissue.
Key points about gynecomastia
Gynecomastia is an overdevelopment or enlargement of the breast tissue in children
and adults who have a penis.
The breasts become larger. They often grow unevenly.
It's often caused by changes in levels of the hormones estrogen and testosterone.
Other things may cause it as well.
Most cases happen when a preteen or teenage child is going through puberty. But it
can also happen to newborn babies and older adults.
It often goes away on its own. In some cases, hormone therapy is needed. Surgery may
also help treat the condition.
Tips to help you get the most from a visit to your healthcare provider:
Know the reason for your visit and what you want to happen.
Before your visit, write down questions you want answered.
Bring someone with you to help you ask questions and remember what your provider tells
At the visit, write down the name of a new diagnosis and any new medicines, treatments,
or tests. Also write down any new instructions your healthcare provider gives you.
Know why a new medicine or treatment is prescribed and how it will help you. Also
know what the side effects are and when they should be reported.
Ask if your condition can be treated in other ways.
Know why a test or procedure is recommended and what the results could mean.
Know what to expect if you do not take the medicine or have the test or procedure.
If you have a follow-up appointment, write down the date, time, and purpose for that
Know how you can contact your healthcare provider if you have questions, especially
after office hours and on weekends and holidays.