Question: how do you know if you have cancer on your balls?
Answer: A painless lump or swelling on either testicle. If found early, a testicular tumor may be about the size of a pea or a marble, but it can grow much larger. Pain, discomfort, or numbness in a testicle or the scrotum, with or without swelling. Change in the way a testicle feels or a feeling of heaviness in the scrotum.