Patients with concussion may have transient impairment of consciousness, retrograde amnesia, and systemic symptoms. 1. Transient impairment of consciousness: after a concussion, the patient will have a transient loss of consciousness, which may last from a few minutes to ten minutes, but generally not more than thirty minutes. 2. Retrograde amnesia: When the patient regains consciousness, retrograde amnesia may occur, unable to recall the injury and the recent events before the injury. 3. Systemic symptoms: Most patients may experience headache, dizziness, fatigue, insomnia, tinnitus, emotional instability, memory loss and other systemic symptoms, which do not last long. Most concussion patients have a good prognosis and do not need special treatment. However, if the patient has headache, nausea and other uncomfortable symptoms for a long period of time, he or she should go to the hospital in time for a clear diagnosis and treatment.