Patients with cerebral infarction are usually the most serious on the 4th-5th day after the onset of the disease, mainly because the 4th-5th day after the onset of the disease is the peak of cerebral edema. For patients with cerebral infarction who have cerebral edema, it is mainly seen in large hemispheric infarction and brainstem infarction, and patients with large hemispheric infarction usually have impaired consciousness, such as drowsiness, lethargy or coma, and most patients have cerebral edema and increased intracranial pressure, and severe increased intracranial pressure can cause brain herniation, which even It can lead to death of the patient. The appearance of cerebral edema usually starts on the second day after the onset of the disease, and the peak of edema is on the fourth to fifth day, and the cerebral edema gradually decreases on the seventh day, and the cerebral edema starts to subside after two weeks. For patients with cerebral infarction who have cerebral edema and increased intracranial pressure, they should be given timely cranial pressure-lowering treatment, and the commonly used drugs include mannitol, glycerol fructose and tachypnea.