Cerebral hypoxia refers to a series of different degrees of brain dysfunction due to multiple system diseases, so that the supply or utilization of oxygen in the blood of the brain cannot reach the metabolic needs of brain tissue. First, the main reasons: 1, hypoxic environment and disease: usually the human body in the oxygen concentration of less than 18% of the environment will feel discomfort, or brain lesions, respiratory distress syndrome, slow heart rate, myocardial ischemia, etc. will also appear in the brain oxygen supply; 2, excessive brain: prolonged brain work will increase the brain’s consumption rate of oxygen, which may produce cerebral hypoxia. At the same time, long ambulatory work time and prolonged pressure on the chest may also lead to insufficient ventilation, which in turn may produce symptoms of cerebral hypoxia. Main symptoms: 1. General manifestations: dizziness, weakness of limbs and blurred eyes usually appear; 2. Aggravation of hypoxia: generally manifested as nausea, vomiting, shallow and fast breathing, fine and rapid pulse; 3. Severe hypoxia: severe hypoxia can lead to respiratory distress, even cardiac arrest and death. Treatment: 1. usually ask professional physicians for differential diagnosis, find the cause of the cause of treatment, improve the lack of oxygen supply to the brain, to ensure an adequate supply of oxygen; 2. the method of rapid relief is to properly inhale oxygen, some patients can get relief after 0.5-1 hours of oxygen intake.