Testicular cancer mostly affects men aged 15 to 49. Anyone with testicles can get it. It's not always clear what causes testicular cancer. You might be more likely to get it if:

• you have or had undescended testicles (when one or both testicles do not drop down into the usual place in the scrotum)
• your brother or father has had testicular cancer
• you've had testicular cancer before
• you have or had a condition called hypospadias where the hole that pee and sperm comes out of (urethra) is not at the tip of your penis
• you have HIV or AIDS
• you are from a white British background