The testicles are located in the scrotum and easy to touch, so the early signs of testicular cancer are easier to find. 1. Enlargement of testis: this is the result of tumor cells multiplying and proliferating in a large number without any end. The shape of enlargement is not uniform, sometimes very irregular, and the testicle on the side with tumor can be enlarged and protruded obviously. 2. Hard texture of testicle: touching testicle with hand is like stone, hard texture, which is significantly different from common testicle inflammation when testicle is uniformly swollen and softer in texture. Despite the hardness of the testicles, there is no pain when pressing and touching, which is also different from testicular inflammation. 3. Heavy feeling of testicle: As testicular tumor is formed by massive growth of tumor cells, so it is a substantial mass, after growing to a certain extent, the weight of testicle increases suddenly, and the patient will have a heavy feeling of falling, even affecting walking. If the testicle is lifted up by hand, it is like holding a stone with a certain sense of weight. 4. Negative translucency test: In general, when there is syringomyelia, the translucency of scrotum and testicle will be enhanced, and the translucency test will be positive. The testicular tumor grows densely and solidly, and there is no liquid inside, so the light transmission will be greatly weakened.