Cryptorchidism is caused by congenital incomplete descent of the testes. Cryptorchidism can generally be categorized into unilateral cryptorchidism and bilateral cryptorchidism, both of which are congenital developmental malformations. Unilateral cryptorchidism mainly has the following hazards: First, cryptorchidism may affect the growth and development of testicles, resulting in testicular hypoplasia, affecting the spermatogenic ability of testicles, so it will adversely affect the fertility in the future. Secondly, cryptorchid testis can undergo malignant change or cancer. Under normal circumstances, testicles are located inside the scrotum, and the scrotum belongs to the ideal environment for testicles to survive, and the temperature of the scrotum is 2-3℃ lower than that of other parts. If the testicles are not inside the scrotum, but in other parts of the body, the probability of malignant or cancerous changes is greatly increased. Therefore, once cryptorchidism is found, it is recommended that it needs to be treated with surgery in time.