Concussion is the mildest form of traumatic brain injury. The symptoms of concussion primarily include: first, a brief period of clouded consciousness shortly after the injury, typically lasting from a few seconds to a few minutes, generally not exceeding half an hour; second, retrograde amnesia, where the patient cannot clearly recall the events during the injury, but memory of events prior to the injury remains clear; third, common symptoms such as headache, dizziness, nausea, vomiting, poor sleep, and decreased memory; fourth, the patient's cranial examination reveals no significant abnormalities, and lumbar puncture cerebrospinal fluid color and tests are normal.