Alcohol cannot be consumed when liver function is abnormal because alcohol contains ethanol, which is converted into acetaldehyde in the liver and finally metabolized into acetic acid. Ethanol and acetaldehyde have a direct toxic effect on liver cells, which can destroy the integrity of liver cell membranes and lead to liver inflammation and necrosis, and also damage liver mitochondria to affect energy metabolism, so drinking alcohol can aggravate inflammatory damage to the liver. Many patients usually have the habit of drinking alcohol and can develop alcoholic liver disease and alcoholic hepatitis. If they now have abnormal liver function, drinking alcohol again will undoubtedly add to the problem and worsen the degree of necrosis of the original liver inflammation. Clinical examples of acute liver failure caused by alcohol consumption are often encountered.