Minor concussions are often characterized by dizziness, nausea and vomiting, short-term coma and retrograde amnesia. 1. Dizziness, headache, nausea and vomiting: The vast majority of patients with mild concussions have dizziness, headache, nausea and vomiting, which is mainly due to intracranial high pressure in the head and stimulation caused by cerebral dysfunction after trauma. 2. Short-term coma: short-term coma generally refers to the duration of coma, less than half an hour, generally speaking, can wake up on their own, and will not produce very serious subsequent changes in consciousness. 3. Retrograde amnesia: that is, the inability to remember what happened at the time of the injury and the recent events before the injury. If the above symptoms appear after trauma suspected concussion, need to go to the neurosurgery department of the hospital in a timely manner, under the guidance of the doctor’s active treatment.