The Chicken-or-Egg Problem in Dual Diagnosis: Why Determining Which Disorder Came First Is Harder Than It Sounds
When a patient presents with both a psychiatric disorder and a substance use disorder, clinicians face one of medicine's most vexing sequencing puzzles: did the mental health condition drive the substance use, or did chronic substance exposure reshape the brain into a state that mimics psychiatric illness? Getting that sequence wrong doesn't just affect the diagnosis—it can derail the entire treatment trajectory. Addiction psychiatrists, neurobiologists, and clinical case examples illuminate why