How does alcohol use disorder differ from physical dependence on alcohol?

Alcohol use disorder (AUD) and physical dependence are distinct concepts, though they are often conflated in casual conversation.

Physical dependence is a physiological state where the body adapts to the repeated presence of a substance, such as alcohol, to maintain normal functioning. It is characterized by the development of tolerance—needing higher doses to achieve the same effect—and the emergence of withdrawal symptoms (e.g., nausea, shaking) when use is reduced or stopped. Crucially, physical dependence can occur even when a substance is used exactly as prescribed for medical purposes and does not necessarily imply addiction.12

Alcohol use disorder is a broader medical condition defined by behavioral and psychological patterns. It involves a loss of control over alcohol consumption, strong cravings, and continued use despite negative consequences to one's health, work, or family obligations. While AUD may involve physiological dependence, it is primarily characterized by the behavioral inability to stop or control intake. Unlike simple physical adaptation, AUD involves long-lasting changes in brain pathways related to reward and impulse control, making it a chronic disorder that typically requires ongoing management.324