1. Dislocations are mostly caused by the joints hitting the ground hard during a fall, or being pulled by gravity. Dislocation is commonly known as dehiscence. The human joint is made up of two bones. One bone has a fossa at the end of the bone, and the other has a drumstick at the end of the bone, which is trapped in the fossa and connected by the muscle bladder to form a joint that moves freely. In children, the joint fossa is shallow and the muscle membrane that connects it is weak, so the malleolus is easily dislocated by gravity, resulting in a dislocation. After a dislocation, it is easy to relapse and dislocate again when gravity is applied. After a dislocation, the joint is swollen, drafty and immobile. When dislocation is encountered, it should not be handled by oneself, but must be sent to the hospital or find a Chinese orthopedic doctor to do reset treatment. 2, concussion human brain like a piece of tender tofu fixed in the skull. It is made up of many nerve cells, which connect all parts of the body and play an important role. When subjected to strong vibration, the nerve cells are stimulated and some symptoms appear depending on the degree. Dizziness, nausea, and vomiting can occur in mild concussions, and in severe cases, paleness or even coma can occur. When mild concussion occurs, you can tell the child to lie down in a quiet environment, don’t move, and it will naturally get better after resting for 2-3 hours. If the condition is serious, with more than vomiting, headache, pallor, and coma and convulsions, the child should be sent to the hospital for resuscitation without delay. 3, visceral injury serious falls, crush injuries and other injuries to the internal organs, the child can appear pale, cold hands and feet, unconscious, weak and fast pulse, respiratory difficulties, indicating that the condition is very serious, regardless of whether there is no trauma. They should be sent to the hospital for rescue.