It is often said that concussions occur, but the definition of concussions is mostly unclear to people. Concussion is when there is a short period of unconsciousness after an external blow to the head, within 30 minutes, and after waking up, there is often retrograde amnesia, i.e. near-event amnesia, with or without headache, dizziness, nausea, anorexia, vomiting, tinnitus, inattention and other symptoms, and the vital signs (blood pressure, respiration and pulse) are basically normal,,. There were no positive signs in the neurological examination, and the cerebrospinal fluid pressure and composition were normal in the lumbar puncture examination, which was a mild craniocerebral injury.