Bad liver is considered to be a liver disease such as liver impairment, alcoholic hepatitis, viral hepatitis and cirrhosis. Drinking red does not mean that you have liver disease. Redness is usually caused by a lack of the enzyme acetaldehyde dehydrogenase in the body or by drinking more than the body’s metabolic capacity. Under normal circumstances, alcohol is broken down into acetaldehyde by the enzyme ethanol dehydrogenase. When the body’s acetaldehyde dehydrogenase level is low or deficient, acetaldehyde will reach the whole body with blood circulation to induce vasodilatation and the symptoms of flushing. Prolonged or heavy drinking may lead to liver function damage or even alcoholic hepatitis. However, the symptom of redness after drinking alone cannot determine whether it is a liver disease or not, and further examination of liver function and liver and gallbladder ultrasound are needed to find out the cause.