The specific clinical manifestations of a patient with traumatic brain injury depend on the condition of his injury. Generally, in mild traumatic brain injury, there will be transient impairment of consciousness, dizziness, headache, nausea and vomiting; if the injury is very serious, the patient may be directly unconscious at that time or the patient will have dizziness and headache after the injury, and after a period of time, there will be impairment of consciousness, and the patient will not be able to wake up. Craniocerebral injuries may be followed by cerebral contusion, lymphatic system injury, or secondary chronic hemorrhage. In the case of lymphatic system injury, the patient presents with impaired consciousness, and the length of time varies depending on the patient’s injury. Therefore, if you encounter a craniocerebral trauma and experience dizziness, headache or nausea and vomiting, it is recommended that you go to the hospital for a CT scan to further rule out a brain hemorrhage.