Comorbidity

Comorbidity means two or more health conditions occurring in the same person at the same time. In mental health, it often changes how treatment is planned and sequenced.

Definition from Shrinktionary, reviewed by Shariq Refai, MD, MBA, FAPA (last reviewed 2026-06-26). Shrinktionary is the network's language layer and carries the canonical short definition; this page adds the research-context detail below. Full definition on Shrinktionary →

Conditions often travel together. When a person has both an anxiety disorder and another condition, such as depression or a substance use disorder, those conditions are comorbid. In mental health, comorbidity is common; it isn't the exception.

Comorbidity shapes how anxiety is studied and treated. Many anxiety trials exclude people with significant comorbid conditions, which makes the trials cleaner but less like real life. Comorbid anxiety and depression in particular is linked to greater impairment and a longer path to recovery than either condition alone.

A person with generalized anxiety disorder who also meets criteria for major depression has comorbid anxiety and depression. Treatment usually has to account for both rather than one at a time.

When you read that a treatment works for anxiety, check whether the trial enrolled people with comorbid conditions or screened them out. A treatment proven in a comorbidity-free trial may behave differently in the many real patients who carry more than one condition.