My one testicle is much bigger than the other and hurts sometimes. How can I find out if it's a problem? – Brandon* You should see a doctor very soon. If one testicle is a lot bigger than the other and it hurts at times, it's a sign of testicular torsion. Testicular torsion is a serious problem that needs to be fixed quickly. If it goes on too long, a guy might need an operation to have his testicle removed. It's normal for guys to have one testicle a bit bigger than the other. A normal size difference is about the size of half a teaspoon —and usually the right testicle is larger than the left. In your case it sounds like something is going on and you need to see a doctor. *Names have been changed to protect user privacy. Back to Articles Related Articles Testicular Torsion This emergency condition happens when the spermatic cord gets twisted and cuts off blood supply, causing pain and swelling. Find out what to do in this article for teens. Read More Why Do My Testicles Ache? Find out what the experts have to say. Read More What Should I Do About Lumps in My Testicles? Find out what the experts have to say. Read More Why Does the Doctor Have to Examine My Testicles? Find out what the experts have to say. Read More Varicocele A varicocele is an enlargement of the veins in the scrotum. Although there is no way to prevent a varicocele, it usually needs no special treatment. Read More Is My Penis Normal? Just about every guy wonders about the size of his penis at one time or another. Read More Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.