A seizure occurs after a concussion injury. This is because after a head injury, its onset is primarily a result of the corresponding clinical symptoms. Many people experience dizziness, headache, nausea and vomiting, near-event amnesia (inability to accurately recall the situation at the time of injury), and transient loss of consciousness (usually no more than 30 minutes) immediately after the injury, which are all symptoms of a concussion attack immediately after the injury. However, some patients do not necessarily experience all of the above symptoms, or only one or a few of them, and their episodes are usually fully manifested in about 3 days. Treatment of concussions is mainly rest-based, and most patients can have their symptoms resolved within two weeks.