Substance use or substance use disorder (SUD) is a mental health condition that is characterized by a pattern of using substances in a way that causes distress, disruption or impairments to one’s life. It can significantly impair your health, relationships and without treatment can potentially be life-threatening. Substance use exists on a spectrum with symptoms varying from mild, moderate or severe. It typically involves an overpowering or compulsive desire to use the substance which often increases one’s tolerance for it. The results can be cravings and withdrawal symptoms when one tries to stop taking the substance. It’s also important to note that a person is capable of having more than one substance use disorder at a time. For example, a person may struggle with alcohol use disorder as well as heroin use disorder simultaneously.