Drinking alcohol will occur red face is caused by vasodilation, vasodilation of the body’s acetaldehyde dehydrogenase deficiency, due to alcohol in the metabolism of acetaldehyde and the accumulation of caused by. Alcohol metabolism is mainly ethanol in the body, metabolized by ethanol dehydrogenase to acetaldehyde, acetaldehyde dehydrogenase metabolized to acetic acid, and then by acetic acid into water and carbon dioxide, each person’s body of acetaldehyde dehydrogenase content is different, ethanol dehydrogenase content is also different. Some people have less ethanol dehydrogenase and less acetaldehyde dehydrogenase. This kind of people after drinking alcohol because alcohol will be metabolized to acetaldehyde, in the case of low acetaldehyde dehydrogenase will cause the accumulation of acetaldehyde, and acetaldehyde has the function of making blood vessels dilated, so the capillaries of the face with the increase of acetaldehyde, appear to gradually dilate, and then cause the symptoms of flushing. It is sometimes relieved by increased activity in the metabolism of enzymes in the patient or drinker, or by inducing the production of more enzymes. Alcohol drinkers should also be aware that they should take precautions against falling if they are unsteady in walking. Drinkers should be careful to keep warm as their body functions decline. In order to keep the respiratory tract open after drinking, it is best for the patient to sleep with a short pillow.