Concussion is often said clinically, and some patients are also very worried about concussion, fearing that there are sequelae. In fact, concussion refers to the transient brain dysfunction (unconsciousness) that occurs immediately after a violent blow to the head without organic damage, and is a relatively minor clinical cranio-cerebral injury. Its clinical manifestations: 1. transient loss of consciousness immediately after the injury, generally within 30 minutes, and drowsiness can occur after waking up; 2. retrograde amnesia, the longer the amnesia, the more serious the injury; 3. there are often signs of neurological disorders such as headache and dizziness, nausea, vomiting and panic; 4. there are no localization signs of the nervous system; 5. lumbar puncture manometry and cerebrospinal fluid laboratory tests are normal. Patients who meet the above clinical criteria for concussion have also been found to have focal lamellar hemorrhage and cerebral edema images in the brain during CT or MRI examinations, which are also consistent with the diagnosis of cerebral contusion, so concussion patients should also pay attention to changes in their condition to avoid missing secondary hemorrhage, which may cause serious consequences.