Dual Diagnosis

Dual diagnosis is a term used to describe people with mental illness who have coexisting problems with drugs and/or alcohol. The relationship between the two is complex, and the treatment of people with co-occurring substance abuse (or substance dependence) and mental illness is more complicated than the treatment of either condition alone. This is unfortunately a common situation—many people with mental illness have ongoing substance abuse problems, and many people who abuse drugs and alcohol also experience mental illness.