Whether or not a brain bleed of 20 ml is serious depends on the location of the bleed, if it is in the cerebral cortex or basal ganglia area, a bleed of 20 ml is not considered serious. If it is in the cerebellar hemispheres or brain stem, it is very dangerous and can be life threatening. At this time, it is necessary to go to the bone flap or by the neurosurgery department for hematoma removal to avoid brain herniation. For the prevention of cerebral hemorrhage, you should control your blood pressure, high blood pressure is the first risk factor for cerebral hemorrhage, and avoid emotional stress and late nights. More aerobic exercise is helpful to prevent arteriosclerosis, which can reduce the occurrence of cerebral hemorrhage.