Oxygen poisoning, if the symptoms are mild, usually there will be dizziness, headache, nausea, vomiting, poor mental state, pale or uncoordinated hands and feet, poor mental concentration, weakness of the limbs and other manifestations. If the symptoms are more serious, there can be changes in the state of consciousness, such as mental blurring or irritability, delirium, etc., and in severe cases, there will be coma, especially moderate or deep coma, accompanied by a drop in blood pressure, cold sweat and other symptoms of shock, and the most serious central respiratory and circulatory failure, resulting in death.