Tenderness or general discomfort . A tender testis is rarely a sign of cancer, but anytime your testicles hurt without being bumped, it's a good idea to have them checked out by a doctor. Either problem is treatable by a physician. Hardness in the entire testicle . This is usually the result of a hydrocele, a cystic mass in the testicle.
Hydroceles are easily treatable, too.
Discharge from the penis .