Cerebral hemorrhage is the rupture of a blood vessel inside the brain parenchyma in the absence of trauma, and blood enters the brain tissue to form a hematoma and compress brain cells, resulting in ischemia and necrosis of brain cells. Whether a brain hemorrhage of 20mL is serious depends on the location of the hemorrhage, the age of the patient and whether the patient has atrophy in the brain. If the brain hemorrhage 20mL is located in the cerebral hemispheres or lobes, this site is relatively extensive and does not lead to a serious outcome. However, if the brain hemorrhage is located in the brainstem, it may lead to serious consequences. 20mL of brain hemorrhage in the brainstem is enough to be fatal and cause the patient’s death. If a 20mL brain hemorrhage is located in the cerebellum, it can cause swelling of the cerebellum and lead to compression of the fourth ventricle, which may also trigger the patient’s death. This is relatively less dangerous if the patient is older or if the patient has more severe brain atrophy and there are many voids in the skull that can put down the swollen brain tissue. In order for the patient to pass this period peacefully, regardless of the severity of the symptoms, active rescue treatment is needed to control the blood pressure and avoid the recurrence of cerebral hemorrhage in a hypertensive condition, and surgical treatment is performed if necessary.