According to the Diagnostic and Statistical Manual for Mental Disorders, 4th edition, the term substance abuse refers to an unhealthy pattern of substance (alcohol or drug) use that results in significant problems in one of the following ways:
- An inability to adequately take care of your responsibilities or fill your role at work, school, or home.
- The frequent use of substances in situations where it might be dangerous to do so (for example, driving while under the influence).
- Repeated legal problems due to substance use (for example, public intoxication or disorderly conduct).
- The continued use of substances even though the substance use is causing considerable problems in your life.

