Testicular cancer happens when cancer cells grow in the tissues of one or both testicles. The cancer cells can spread to other parts of your body. The testicles, which make and store sperm, are located in a pouch below the penis called the scrotum.

Although rare, testicular cancer is the most common form of cancer in young people with testicles. It is also one of the most curable types of cancer.

Common symptoms include a lump or swelling in a testicle, a feeling of heaviness in the scrotum, and a dull pain in the lower back, abdomen, or groin.