Common pediatric diseases include: 1. Cryptorchidism, which means that after birth, the testicle is completely descended to the cryptosac, and often stays in the inguinal region and pelvic cavity. The environment for testicular growth and development requires a temperature close to the body surface temperature, 1.5 – 2.5C° lower than the body. When the testicle is located in an abnormal position, the high temperature of the surrounding environment can cause cortical atrophy and loss of spermatogenic function (no sperm). When bilateral cryptorchidism causes infertility, and what is more frightening is the tendency of malignant transformation (testicular cancer). Insufficient testicular descent (cryptorchidism) should be treated surgically within 1-2 weeks after birth to ensure its normal development and save its influence on spermatogenic function. A. Testicular or spermatic cord sphincter effusion, when the testicle descends to the cryptorchid in 6–7 months of pregnancy, its accompanying sphincter will close automatically, when the closure is incomplete, a small channel will be left with the abdominal cavity, and the fluid in the abdominal cavity will enter the testicle or spermatic cord sphincter along this channel to form effusion, which is usually greenish purple after activity, and can be reduced in the morning after resting at night. The regular treatment should be to ligate the sphincter and open the sphincter cavity below the effusion in order to cure it at all. Only a small number of pediatric hernias can be cured conservatively, and most of them need surgery to ligate the neck of the hernia sac (syringomyelia) in order to be completely cured.