Alcohol use disorder refers to a pattern of excessive drinking that results in adverse health and social consequences. Alcohol abuse is when a person drinks alcohol to help change how they feel and gets complaints about their drinking. Alcohol dependence involves craving alcohol, impaired control over drinking, withdrawal symptoms when stopping, and needing more alcohol to feel its effects. Heavy or binge drinking can damage one's health by affecting the gastrointestinal, central nervous, and cardiovascular systems and increase risks of injuries, violence and accidents.