Clinically, a variety of circumstances can lead to cerebral hypoxia, as follows: 1, gas poisoning: If there is acute gas poisoning, including carbon monoxide or carbon dioxide and other toxic gases, you can check the arterial blood gas, look at the value of carboxyhaemoglobin, if this indicator is relatively high, it is acute poisoning, which can reflect the degree of poisoning. Then look at the partial pressure of oxygen in the arterial blood gas, such as the partial pressure of oxygen is relatively low, the body may be in a state of hypoxia. 2, dizziness and headache symptoms: if the dizziness, headache, etc., do not consider cerebral hypoxia, may be related to ischemia, consider sleep deprivation or peripheral vertigo, etc., is a vascular spasm caused by the blood supply problem, need to be identified. If it is gas poisoning, the best treatment can be hyperbaric chamber oxygen therapy in the acute stage.