Some people have no special changes, just simple headache and dizziness, but after active rest, there is nothing special in the later stage. Some people will experience coma, nausea and vomiting, which are relatively severe, and possibly concussion, requiring a CT head examination. In more severe cases, the coma lasts longer than half an hour and is accompanied by bleeding from the head, which requires hospitalization for observation and treatment and the application of appropriate medications to stop bleeding. If more serious, it may directly cause coma, dilated pupils, intracranial hemorrhage, or even respiratory and cardiac arrest resulting in death, so each phenomenon is different and is decided according to different changes in the condition.