The danger period of cerebral edema is determined by the size of the lesion in the intracranial lesion, and the danger period may vary depending on the size of the lesion. The risk period of cerebral edema lasts for about 2 weeks, during which the patient may experience changes in blood pressure and heart rate at any time. At the beginning of the dangerous period of cerebral edema, the heart rate is mainly slowed down, and later on, the heart rate may increase, and arrhythmia and atrial fibrillation may occur, and brain herniation may be formed to endanger the life of the patient. If cerebral edema is present, active treatment with dehydrating and cranial pressure-lowering drugs is needed to reduce symptoms and promote recovery. Cerebral edema can lead to increased intracranial pressure, which can cause frequent vomiting and nausea, and care should be taken to avoid accidental aspiration. If cerebral edema is particularly severe and brain herniation occurs, surgical decompression of the bone flap is required.