What is the difference between mild, moderate, and severe alcohol use disorder?

The difference between mild, moderate, and severe alcohol use disorder lies in the number of diagnostic criteria met and the level of impairment experienced. Mild alcohol use disorder is characterized by the presence of 2-3 criteria, moderate by 4-5 criteria, and severe by 6 or more criteria. Severity is also determined by the impact on the individual's daily functioning and the level of distress or impairment caused by the disorder.