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?
– Tyrone*

When a guy goes through puberty, all kinds of changes take place in his body. One of these changes is 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 just about every guy experiences it. Talk to your doctor about any concerns or questions that you may have.

For more information, check out these articles:
I'm a Guy . . . So How Come I'm Developing Breasts?
Everything You Wanted to Know About Puberty

Reviewed by: Larissa Hirsch, MD
Date reviewed: September 2006

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Although we can't reply personally, you may see your question posted to this page in the future. If you're looking for medical advice, a diagnosis, or treatment, consult your doctor or other qualified medical professional. If this is an emergency, contact emergency services in your area.

*Names have been changed to protect user privacy.