Alcohol abuse is related to a wide variety of medical complications including liver diseases, pancreatitis, cardiovascular diseases, immunological abnormalities, malignant neoplasms, endocrine disturbances, and kidney problems. The liver is the organ most severely affected by alcoholism. Alcoholic liver disease (ALD) remains a major cause of morbidity and mortality in Korea. The mainstay of therapy for alcohol-related medical problems is cessation of drinking. This article summarizes alcohol-related medical complications and treatment with focus on alcoholic liver injury.