Usually the people said home gas poisoning or natural gas poisoning, usually carbon monoxide poisoning, due to incomplete combustion of natural gas produced. The clinical manifestations of carbon monoxide poisoning and carbon monoxide exposure time, concentration, the patient’s basic state has a relationship, the performance does not have specificity, specific as follows: 1, mild poisoning will have a headache, dizziness, nausea, vomiting and other manifestations, out of the poisoned environment, inhalation of fresh air can be relieved; 2, moderate poisoning generally have severe headache, nausea, vomiting or even blurred vision, vision loss or judgment decline, etc. manifestations, but generally do not appear consciousness disorder or after oxygen therapy, quickly return to normal; 3, severe poisoning will have a severe headache, nausea, vomiting, or even blurred vision, vision loss or judgment loss The performance of moderate poisoning will have severe headache, nausea, vomiting and even blurred vision, vision loss or judgment decline, but generally will not appear consciousness disorder or after oxygen therapy, quickly return to normal; 3, the performance of severe carbon monoxide poisoning can have varying degrees of consciousness disorders, nausea, vomiting, aspiration, or even cerebral edema, pulmonary edema, or multi-organ failure, can also appear convulsions. One-time inhalation of high concentration of carbon monoxide poisoning, death can occur.