Gas leak poisoning is an acute form of carbon monoxide poisoning, which is usually followed by hypoxemia and tissue hypoxia. However, brain cells are the most sensitive to the lack of oxygen in the body, followed by the heart and other organs throughout the body. In the case of mild poisoning, the main symptoms are dizziness, headache, nausea, vomiting, and weakness of the limbs. If moderate poisoning occurs, in addition to the above symptoms, there will be panic, chest tightness, shortness of breath, difficulty in breathing or further aggravation of brain performance; blurred vision, hallucinations, even irritability, unsteady gait, loss of judgment, etc.; in severe cases, there will be drowsiness, blurred consciousness, etc., and the skin of the whole body will appear cherry red, which are the typical manifestations of gas poisoning. If the symptoms of poisoning are further aggravated and reach the condition of severe poisoning, the patient will experience deep coma, convulsions, respiratory depression and respiratory distress and heart failure, which may lead to cardiac arrest and death.