Ah, puberty. It can be a very interesting time in a guy's life, what with all
the changes going on. In fact, it seems like every day something on your body
grows bigger or hair begins sprouting somewhere. Each day brings a new change or
two, and it can sometimes feel like it's hard to keep up.
It doesn't happen to every guy, but one of these changes can be the
development of breast tissue. It's called gynecomastia (pronounced:
guy-nuh-ko-mas-tee-uh) and it's completely normal - and almost always
temporary. So how exactly does a guy happen to develop breast tissue?
What Is Gynecomastia?
Gynecomastia is a condition
in which breast tissue forms in guys, usually due to normal hormonal changes
during puberty. Hormones are chemicals produced by your body's glands. In a guy,
hormones produced in the testicles are responsible for the physical changes that
begin to take place during puberty - facial hair, muscle development, a
deepening of the voice, and the lengthening of the penis, for example. Guys and
girls produce both androgens (hormones that help develop and maintain
male characteristics) and estrogen (a hormone that is responsible for
most female characteristics).
Guys have mostly androgens in their systems, but they also have small amounts
of estrogen. In girls, breast growth is caused by high levels of estrogen.
Normally, when going through puberty, a guy's production of androgens increases
significantly, whereas estrogen production remains low.
However, sometimes guys produce enough estrogen during puberty that some
breast tissue develops. Breast tissue growth in guys can appear on one or both
sides of the chest, and the breast area can feel tender. This doesn't mean
you're turning into a girl or anything. It's just a minor change in your
hormones as you begin to grow into adulthood.
It's estimated that about half of all males going through puberty experience
some degree of gynecomastia in one or both breasts. Gynecomastia is almost
always a temporary condition, and it's very unusual for the breasts to stay
developed - they will eventually flatten out completely within a few months to a
couple of years. It usually goes away on its own and no medical treatment or
surgery is needed.
Even though it's just a temporary change for most teens, some guys with
gynecomastia feel embarrassed or self-conscious about their appearance. Many
guys find that wearing loose-fitting shirts helps make the condition less
noticeable until the breast tissue shrinks over time. Surgical removal of the
breast tissue is an option in some cases. If a guy finds his gynecomastia is
bothering him, he can talk to a doctor about it.
Although the most common cause of gynecomastia is puberty, it can sometimes
be caused by certain diseases or side effects of some medications. Using illegal
drugs such as anabolic steroids, marijuana, or heroin can also disrupt hormonal
balance and lead to gynecomastia.
There's also something called pseudogynecomastia (or false
gynecomastia). This has nothing to do with puberty or hormones. It's just simply
due to the fact that some guys have extra fat in the chest area, making it look
like they have breasts. A doctor's exam can tell whether a guy has gynecomastia
or pseudogynecomastia.
If you're concerned or have any questions about gynecomastia, talk to your
doctor. Keep in mind that temporary breast tissue growth in guys is a
common part of puberty that will usually go away on its own.
Updated and reviewed by: Steven
Dowshen, MD
Date reviewed: April 2004