What is the cause of high and low blood pressure after cerebral hemorrhage, mainly seen in the following situations: first, the patient is irritable, after cerebral hemorrhage, the patient will appear due to headache, intracranial hypertension symptoms cause irritability, restlessness, this time the patient can appear high blood pressure, irritability control after the blood pressure can be reduced to normal; second, after the patient stool or feeding will appear high blood pressure, half an hour later blood pressure Therefore, in both cases, the patient can have high and low blood pressure; thirdly, in patients with cerebral hemorrhage, the basic blood pressure is unstable before the hemorrhage, so after the hemorrhage, the intracranial hematoma is caused by the compression of the hematoma, which can easily cause the destruction of the blood-brain barrier and the imbalance of the cerebral blood flow itself, so the patient can have high and low blood pressure; fourthly, in patients with massive cerebral hemorrhage, the patient can have high and low blood pressure. Fourth, in patients with massive cerebral hemorrhage, the instability of vital signs can easily cause sudden high and low blood pressure.