Patients with brain hemorrhage who are comatose and unable to wake up are mainly suffering from severe organic damage to the brain, commonly due to massive brain hemorrhage or brain hemorrhage in critical areas. Massive cerebral hemorrhage is seen in the basal ganglia region or lobes and may lead to impaired consciousness if the hemorrhage is 30 ml or more. The hematoma of a simple hemorrhage leading to a dominant effect will not be particularly pronounced, but as the course of the disease prolongs, the patient will develop significant cerebral edema around the lesion, which may induce brain herniation and lead to severe brain dysfunction and often coma. In case of cerebral hemorrhage at a critical site, usually the brainstem or cerebellum, brainstem hemorrhage that exceeds 5 ml can lead to coma, hyperthermia, and tetraplegia. Cerebellar hemorrhage that exceeds 15 ml may lead to brain herniation and, in addition to impaired consciousness, respiratory and cardiac arrest, respiratory and circulatory failure, and other symptoms.