The causes of brain poisoning are as follows: carbon monoxide poisoning, due to excessive inhalation of carbon monoxide in the body, carbon monoxide and hemoglobin combination leads to oxygen can not be combined with hemoglobin, the brain cells appear to lack of oxygen, the lesser of which is unresponsive, the more serious appear coma. Clinically, some patients with carbon monoxide poisoning will have delayed encephalopathy, and patients with carbon monoxide poisoning should be immediately removed from the poisoned environment and treated with hyperbaric oxygen. Alcoholic encephalitis, due to the patient’s large amount of alcohol leading to central nervous system damage, more common is Wernicke’s encephalopathy, etc., to give the patient a large dose of supplemental B vitamins, and at the same time, quit drinking. Third, drinking pesticides caused by poisoning, such as paraquat or organophosphorus can lead to nerve damage in the brain, the patient appeared cognitive function decline, serious coma, death.