Brain tumor surgery usually takes about 2 weeks to get through the danger period. Bleeding in the operation area, intracranial infection and cerebral edema may occur after brain tumor surgery. 1. Bleeding in the operation area: Usually bleeding in the operation area occurs within 24 hours after the operation, so the hemostasis treatment should be carried out in time after the brain tumor operation. 2. Intracranial infection: intracranial infection usually occurs about 3 days after the operation, if the patient has persistent high fever with headache after the operation, intracranial infection should be considered. 3. Cerebral edema: the pulling of brain tissue during surgery will cause postoperative cerebral edema, which usually begins to occur after surgery, reaches its peak in about 5 days, and can subside in about 2 weeks. Cerebral edema should be actively controlled after surgery, otherwise excessive cerebral edema will cause brain hernia. Usually, the condition of the patient is stable after two weeks of postoperative cerebral edema, but there are big differences between patients, so it is recommended to consult a neurosurgeon for details.