What are some common signs of substance use disorder?

Tolerance, withdrawal, and continued use despite problems are key indicators of substance use disorder. Tolerance refers to the body's adaptation to a substance, leading to an increased need for a larger amount to achieve the same effects. Withdrawal symptoms occur when a person reduces or stops using a substance, and these can vary in severity, often causing physical and psychological distress. Continued use despite experiencing negative consequences—such as health issues, trouble maintaining relationships, or legal problems—demonstrates a lack of control over the substance use and a compelling drive to continue, highlighting the disorder's psychological and physiological grip on the individual.

In contrast, increased productivity and motivation suggest a positive engagement with life and are not characteristics associated with substance use disorder. A casual attitude towards the substance may imply lower engagement and risks associated with use, but it does not necessarily indicate a disorder. Regular participation in social activities can be normal behavior and does not specifically indicate the presence of substance use disorder unless those activities are centered around the substance itself or are affected by its use. Thus, the presence of tolerance, withdrawal, and ongoing use despite problems is critical in identifying substance use disorder.