Normal testicles are regular and oval in shape bilaterally with smooth surface and no pressure or tenderness. If the testicles become irregular and show symptoms such as lumps and pain, then a disease of the testicles may be the cause. Testicles are male reproductive organs, located in the scrotum, one on each side, normal testicles are oval in shape with smooth surface. Irregular testicles are usually caused by testicular diseases. If the testicles become hard in texture and appear swollen and painful with tenderness, consider orchitis. The presence of a gradually increasing mass in the testicle, accompanied by pain in the scrotum or testicle, consider testicular tumor. In addition, testicular syringomyelia, varicocele, and testicular trauma may cause the testicular pattern to become irregular. Therefore, when the testicle becomes irregular, it is necessary to go to the hospital to improve the testicular ultrasound and other related examinations, so as to make a clear diagnosis and active treatment.