There are two main reasons for testicular torsion in children, one is the normal testicular position with a high testicular position, and the other is the case of cryptorchidism, as follows: 1. Normal testicular position: the spermatic cord and testicular lead belt are relatively loose, the spermatic cord is longer, the testicle will be like a pendulum, swinging inside the scrotum with the rhythm of body movement, and sometimes when performing more strenuous movements, the testicle will 2. Cryptorchidism: In cryptorchidism, the testicle can be positioned up or down, with a large degree of mobility and poorly developed lead belt, which fails to enter the scrotum, causing the testicle to rotate inside the groin, resulting in testicular torsion, and one of the main manifestations is redness, swelling and pain in the scrotum and redness, swelling and pain in the groin area. In case of the above symptoms, parents must be alert and bring their children to the pediatric urology department in time for urological ultrasound examination, early detection of testicular torsion and early surgical diagnosis and treatment.