If the testicles become larger and harder, it is recommended to go to the hospital for further examination to clarify the specific cause. There may be: 1. Inflammation of the testicles, which may result in an increase in size and density accompanied by significant pain and pain when touched by hand. It is recommended to go to the hospital for ultrasound examination of the testicles and routine blood tests to confirm the presence of orchitis. 2. Testicular tumor, which can be manifested as an increase in testicular volume and hardening of the density, pain is not obvious, with time, the volume can gradually increase, also can be accompanied by testicular syringomyelia. The testicular oncology index test and testicular ultrasound test are needed to further confirm the diagnosis. 3. epididymitis, epididymitis first shows an increase in the volume of the epididymis, and then involves the testicles with increased volume and hardened texture. The hardened texture is unevenly hardened, mainly on the posterior and lateral side of the testicle, while the ventral side is relatively soft.