Dual diagnosis means you have two conditions at once: a substance use disorder and a mental health condition like depression, anxiety, PTSD, or bipolar disorder. This pairing is common. Most people who come in for addiction treatment are also dealing with something underneath the drinking or drug use, or something the substances made worse. Dual diagnosis treatment addresses both problems together, in the same plan, instead of treating one and hoping the other sorts itself out. That combined approach gives you a better shot at staying sober.