Alcohol intoxication, i.e. ethanol poisoning, can cause central nervous system symptoms, specifically related to its blood concentration, which can be divided into euphoria, ataxia and coma. 1. Excitement period: blood ethanol concentration reaches 11mmol/l, you can feel headache, excitement, euphoria, etc. If the concentration exceeds 16mmol/l, you can feel moody. If the concentration is more than 16mmol/l, there can be emotional instability, self-conceit, irritability, etc., and some patients may also be silent. 2. Ataxia stage: blood ethanol concentration reaches 33mmol/l, muscle incoordination, clumsy action, nystagmus, blurred vision, unsteady gait and other manifestations. If the blood ethanol concentration reaches 43mmol/l, there may be nausea, vomiting and other manifestations. 3. Coma stage: blood ethanol concentration of 54mmol/l, the patient can enter the coma stage, there are lethargy, pupil dilatation, body temperature drop. More than 87mmol/l, the patient into a deep coma, can appear low heart rate, blood pressure drop, respiratory, circulatory paralysis and endanger life. It should be noted that the symptoms of alcoholism are also related to the individual’s tolerance, etc.. If you feel unwell, it is recommended that you seek prompt medical attention and treatment.