Brain hemorrhage in car accident is not very standardized, because brain hemorrhage caused by car accident is secondary to cranial injury, which should be in the category of craniocerebral trauma in neurosurgery, generally speaking, brain hemorrhage is spontaneous brain hemorrhage, which is different from brain hemorrhage in car accident. The waking time of brain hemorrhage in car accident is how long it takes to wake up from craniocerebral trauma, and it is generally divided into light, medium, heavy and extra heavy types. Generally, cranial contusion can be awake within 1 hour, if the trauma causes cranial injury within 6 hours, it is generally classified as heavy. There is also that coma is very deep consciousness after trauma, generally classified as diffuse axonal injury, CT examination shows not much hemorrhage, but this kind of disease that is mainly mid-axis a punctiform small amount of hemorrhagic contusion, that is, damage to brainstem, thalamus these important structures, so the patient will be in a vegetative state for several months or a long time. So to sum up, the hemorrhage caused by car accident is craniocerebral trauma hemorrhage, coma within 6 hours can be awake, if heavy with surgery or hematoma removal, decompression, most of 1 month can be awake, if heavy or extra heavy will appear long-term coma unconscious situation or even vegetative survival state.