Excessive bleeding usually does not cause headache, but usually causes coma, because excessive blood loss is clinically known as hemorrhagic shock, the onset of which is mainly due to excessive bleeding, resulting in insufficient effective blood circulation in the body, and brain tissue is most sensitive to ischemic symptoms. If excessive blood loss causes hemorrhagic shock, not only will it not cause headache, but because of brain tissue ischemia, it will cause coma and confusion in the patient, accompanied by decreased blood pressure and increased heart rate. For excessive blood loss, it is clinically necessary to stop bleeding in a timely manner and to cooperate with blood and fluid transfusion to avoid insufficient blood volume leading to hemorrhagic shock, which will then lead to coma of the patient.