1.Cryptorchidism or testicular descent incomplete is a very common congenital disease of the reproductive system in children. Children with cryptorchidism are usually painless and seem to be fine, but it affects the quality of life in the future. Clinically, cryptorchidism shows that the testicles cannot be felt on one or both sides of the scrotum, and the scrotum is empty, often with poor development, flattened shape, or asymmetrical one big and one small on the left and right sides. However, it is not the case that no testicle can be felt in the scrotum is cryptorchidism, other diseases with similar manifestations include ectopic testicle, sliding testicle, epithelial testicle, testicular agenesis, etc. This requires careful examination and diagnosis by an experienced urologist. 2.The main hazards of cryptorchidism to the body are as follows: (1) affecting fertility; (2) combined inguinal hernia or syringomyelia; (3) testicular torsion; (4) psychological impact; (5) cancer.