Testicular cancer lumps are generally about the size of a pea in the early stages and are typically not painful, according to WebMD. Although it is rare testicular cancer is the most common cancer in men under age 35.
Men often first discover the signs of testicular cancers themselves. The cancer typically presents as an enlarged testicle or a painless lump, notes WebMD. Other signs of the disease include a testicle that is shrinking, a dull aching in the groin or lower abdomen, and a heavy feeling in the scrotum. The cure rate for cancer of the testis is approximately 90 percent to 95 percent, even when it has spread to another part of the body, according to MedicineNet.