dual diagnosis
The co-occurrence of a substance use disorder and a mental health disorder in the same individual, requiring integrated treatment.
Full Definition
Dual diagnosis, also known as co-occurring disorders or comorbidity, refers to the simultaneous presence of both a substance use disorder and a mental health disorder in an individual. This condition is extremely common, affecting approximately 50% of people with severe mental illness and requiring specialized treatment approaches that address both conditions concurrently. Common combinations include depression with alcohol use disorder, anxiety disorders with benzodiazepine dependence, or bipolar disorder with cocaine use disorder. Dual diagnosis presents unique clinical challenges because substance use can mask or exacerbate psychiatric symptoms, while untreated mental health conditions can increase vulnerability to substance abuse. Effective treatment requires integrated care that addresses both disorders simultaneously rather than treating them separately.
Usage
Usage note: Hyphenate when used as an adjective (dual-diagnosis program); can be two words when used as a noun.
In Context
- "The patient's dual diagnosis of bipolar disorder and alcohol dependence required coordinated treatment by both psychiatry and addiction medicine." — Treatment planning meeting
- "Dual diagnosis treatment programs show better outcomes than sequential treatment of substance use and mental health disorders." — Clinical research summary