Depending on the severity of the injury, closed cranial injury can be divided into traumatic brain injury, neurological reaction, concussion, skull fracture, cerebral contusion, cerebral contusion, epidural hematoma, subdural hematoma, diffuse axonal injury, etc. These conditions are basically accompanied by headache, dizziness, dizziness, nausea and even vomiting, and other symptoms of neurological dysfunction or injury. At the same time, each case also has some of its own characteristics, for example, concussions are mostly accompanied by retrograde amnesia, where the patient cannot recall the injury after the injury; epidural hematoma is characterized by an intermediate waking period; patients with diffuse axonal injury may have more coma, bilateral pupils with variable size and shape, impaired movement of the limbs, and even injury. More severe patients may go directly into coma, with dilated pupils, impaired limb movement, incontinence, and other brain herniation.