The duration of the edema phase of brain hemorrhage is related to the patient’s condition. Some patients with mild cases may have the edema subside in 1-2 weeks, while the edema may take 1-2 months to subside in patients with severe brain hemorrhage. Cerebral edema occurs when a cerebral blood vessel ruptures and blood breaks into the brain parenchyma to form a hematoma that compresses brain cells, causing them to become ischemic and die, resulting in cerebral edema. When hematoma and edema are superimposed in the patient’s brain, symptoms of increased intracranial pressure such as headache, nausea and vomiting may occur, as well as drowsiness, lethargy, coma and other signs of impaired consciousness. Cerebral edema usually occurs 4-5 hours after brain hemorrhage and reaches its peak in 3-4 days. If the amount of brain hemorrhage is relatively small, the edema may completely subside in 1-2 weeks. Severe cerebral edema can lead to life-threatening brain herniation. As the hematoma slowly liquefies and absorbs, the edema will gradually improve, but it may take 1-2 months for the edema to disappear completely. This intercellular or intertissue cerebral edema takes longer to completely eliminate. Drugs commonly used to treat cerebral edema include mannitol, glycerol fructose, and furosemide. During the use of mannitol, care should be taken to monitor blood potassium as well as cardiac and renal function, and albumin may also be used for treatment when available. When patients apply these drugs, they should pay attention to urine output and control water intake and output to avoid electrolyte balance disorders.