The symptoms of a concussion must be judged according to the situation. Different types of individuals may exhibit various clinical symptoms, and not all symptoms described in textbooks will necessarily appear. Many will experience dizziness, headache, vomiting, nausea, and other related clinical symptoms; some may experience transient epileptic seizures, limb numbness and weakness, or speech impairments; some individuals might also experience retrograde amnesia, meaning they forget the events that occurred at the time of the injury; and some may enter a state of coma, lasting more than five minutes but less than half an hour. Therefore, these are all symptoms of a concussion, but not everyone will experience them, and some may also have additional symptoms, which should be assessed based on the situation at the time.