What is gynecomastia?
Gynecomastia is a condition that often occurs in boys during puberty. During this time a boy's breasts may begin to take on
female breast characteristics. He may notice that his breast is tender and that a small area of breast tissue can be felt
beneath his nipple. This condition is very common; about half of all 12- to 16-year-old boys have some degree of gynecomastia.
What is the cause?
Gynecomastia is thought to be caused by an imbalance of hormones in boys during the middle part of puberty.
How is it diagnosed?
Gynecomastia is diagnosed in a boy who has entered puberty and has no other medical conditions or symptoms that suggest a
reason for the breast to develop.
Some medicines may cause enlargement of the male breast. Tell your doctor about any medications or supplements your son is
taking.
How long will it last?
In most cases the tenderness lasts for a few months and then goes away. The breast tissue eventually decreases in size. It
is unusual for the condition to last longer than 2 years. Rarely, this condition advances to the point where your son is embarrassed
about the amount of breast growth.
How can you help take care of your child?
No specific treatment is needed. Loose clothing may be more comfortable than more tightly fitting shirts.
When should you call the doctor?
Call your child's doctor during office hours if:
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gynecomastia is causing emotional problems
-
discharge from the breast occurs
-
you have other concerns about your child's progression through puberty
| Last Reviewed | Reviewed by |
| June 21, 2004 | Andrew James, MBChB, FRACP, FRCPC |
