Some closed brain injuries are not serious, while others are more serious and cannot be generalized. Closed brain injuries are brain injuries in which the dura mater is intact and the brain tissue is not communicating with the outside world, and the severity of the injury is often clearly related to the type of injury. Concussions are temporary disorders of brain function with no structural damage to brain tissue and usually heal with about 2 weeks of rest. Linear skull fractures, minor cerebral contusions, or small amounts of cerebral hemorrhage often do not require surgical intervention and are not serious enough to cause significant brain tissue damage or neurological deficits after conservative treatment. In case of extensive cerebral contusion, massive craniocerebral hemorrhage will result in obvious compression of brain tissue and serious impairment of brain function, even after surgery and postoperative mannitol dehydration, hyperbaric oxygen and other comprehensive treatments, hemiplegia, aphasia, epilepsy, headache, dizziness, and other symptoms may remain, which are more serious. Closed craniocerebral injuries that result in brainstem hemorrhage, diffuse axonal injury, or brain herniation often have a poor prognosis and can result in rapid death, which is very serious. When a closed craniocerebral injury occurs, it is recommended to immediately go to the neurosurgery department of a regular hospital and be treated accordingly.