Testicular cancer usually shows up as a quiet change in one testicle. Because the tumor grows fast, any new difference you can see or feel should be checked quickly. The first sign is a painless lump or firm area inside the ball. It feels like a small pea stuck to the front or side and does not go away. Heaviness follows. The sack feels weighted on one side, and the testicle may hang lower or turn inward. A dull ache or heavy throb can appear in the lower belly, groin, or even the lower back—pain that is felt far from... Learn more