Cryptorchidism can affect fertility. Studies in the literature show that bilateral cryptorchidism causes infertility up to 50% or more, and unilateral cryptorchidism causes infertility up to 30% or more. Cryptorchidism is a condition in which the testicles do not descend normally into the scrotum but remain in the retroperitoneum, inguinal canal or at the entrance to the scrotum. The stretching and contracting function of the scrotum can regulate the temperature of the scrotum, which is 1.5-2℃ below the normal body temperature, and can effectively maintain the normal spermatogenic function of the testicular spermatogenic tubules. Cryptorchidism is affected by high temperature for a long time, which leads to sperm disorder, so cryptorchidism will affect the spermatogenic function. It is recommended that if you have cryptorchidism, you should undergo surgery early.