Concussion is a primary craniocerebral injury, a relatively mild form of brain injury characterized by transient impairment of consciousness and near-event amnesia immediately after the injury. Transient loss of consciousness usually lasts for a few seconds or minutes, usually less than half an hour, and is accompanied by brainstem dysfunction such as pallor, cold sweats, and decreased blood pressure. When the patient regains consciousness, he or she has no memory of the injury or the recent situation, and is often accompanied by headache, dizziness, fatigue, insomnia, and tinnitus, which is called retrograde amnesia and can return to normal after a few days or weeks. It is generally believed that the impairment of consciousness caused by concussion is mainly due to damage to the reticular formation of the brainstem, which is mainly related to the impact of cerebrospinal fluid during brain injury, changes in intracranial pressure at the moment of violent blow, cerebrovascular dysfunction, and mechanical pulling or twisting of the brainstem. Concussion is a temporary dysfunction of the central nervous system with no imaging-visible organic damage. If there are no positive signs after neurological examination by the physician and no intracranial abnormalities on CT examination, no special treatment is usually required, and most patients can recover within 1 week with good prognosis by paying attention to bed rest.