Is It Normal for One Testicle to Be Bigger?

I'm 15, almost 16, and I've noticed that one of my testicles is bigger than the other one. Is there something wrong?

It's normal for teen (and adult) guys to have a slight difference in the size of their testicles. So there's probably nothing wrong. A normal size difference is about the equivalent of half a teaspoon — and usually the right testicle is larger than the left.

Talk to your doctor if it seems like there's a big difference in size or if you have pain or a lump in one of your testicles.

Reviewed by: Steven Dowshen, MD
Date reviewed: July 2009

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