Cerebral hemorrhage is divided into lobar hemorrhage, ventricular hemorrhage, subarachnoid hemorrhage, and brainstem hemorrhage. Brainstem hemorrhage is the most severe type of brain injury. Generally, the volume of hemorrhage is determined in three categories: about five milliliters, ten milliliters, and more than ten milliliters. If it is less than five milliliters, then the volume of hemorrhage is relatively small, and recovery is relatively good, usually without leaving residual symptoms. If it is between five to ten milliliters, life may be preserved, but severe residual symptoms such as hemiplegia, sensory disorders, and motor disorders may occur. However, if it exceeds ten milliliters, the mortality rate is generally very high, making it very difficult to salvage.