The brain is the most important and fragile organ of the human body, which can be damaged due to various reasons, such as traffic accidents, falling from height and other traumas or spontaneous blood vessel rupture and tumors. The performance of brain injury mainly has the following aspects: 1, severe head pain, severe head pain is often accompanied by nausea, vomiting symptoms, this vomiting is mostly persistent, projectile vomiting, different from ordinary vomiting. Headache is also persistent, severe headache, unlike ordinary headache, there can be a completely painless period in the middle; 2, if the condition is more serious, the scope of brain damage is more extensive, the patient will often be combined with impaired consciousness, that is, delirium. For example, lethargy, patients always want to sleep, wake up and then fall asleep or always wake up; 3, the serious state will be comatose, not wake up, loss of consciousness; 4, and then serious injuries can be life-threatening, the patient can appear pupil dilation, and even affect the heartbeat, breathing. This is the most critical situation of brain injury, need to be immediately sent to the hospital for rescue treatment.