Testicular self-exams (TSE) can help you check for things like cancer. Although testicular cancer is rare in teenage guys, overall it is the most common cancer in males between the ages of 15 and 35. It's important to try to do a TSE every month so you can become familiar with the normal size and shape of your testicles, making it easier to tell if something feels different in the future. Back to Articles Related Articles Is It Normal for One Testicle to Be Bigger? Find out what the experts have to say. Read More I Have Bumps On My Penis. Is This Normal? 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 Testicular Exams If you're a guy, you may be wondering why the doctor needs to do a testicular exam. Find out in this article. 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 Male Reproductive System What makes up a guy's reproductive system and how does it develop? Find the answers to these questions and more. 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.