It is relatively common to have a flushed face when you drink alcohol. The main component of alcohol is ethanol, and after drinking alcohol, acetaldehyde can be produced under the action of liver peroxidase. Most people who drink less alcohol have less liver peroxidase, and after acetaldehyde is generated, the body is unable to convert acetaldehyde into acetic acid due to the lack of more peroxidase. When acetaldehyde accumulates in the body, it causes the blood vessels in the face to dilate and blush, and it can also stimulate the heart and make the heart beat faster. This is the reason why some patients have palpitations after drinking.