I'm a Guy. Why Do I Have a Lump In My Breast?

I found a little lump in my left breast and I'm a guy! It only hurts a little when I press on it. What could this be?

When a guy goes through puberty, all kinds of changes take place in his body. One of these changes is often a condition called gynecomastia, when breast tissue enlarges. This is usually temporary, and can happen on just one side, or both. Some guys may also feel tenderness in the breast area when they go through puberty.

Breast changes in teenage guys are part of puberty — and they're rarely serious. That small lump with tenderness beneath the nipple is a normal part of puberty, and lots of guys experience it. Talk to your doctor about any concerns or questions that you may have.

Reviewed by: Larissa Hirsch, MD
Date reviewed: May 2009

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