comorbidity
The co-occurrence of two or more psychiatric disorders in the same individual, either simultaneously or sequentially.
Full Definition
Comorbidity in psychiatric epidemiology refers to the presence of multiple mental health conditions within a single individual, which is remarkably common in clinical and community samples. This phenomenon significantly complicates diagnosis, treatment, and epidemiological measurement. Comorbidity can be concurrent (disorders present at the same time) or sequential (one disorder following another). High rates of psychiatric comorbidity have important implications for disease burden calculations, treatment planning, and understanding of shared risk factors. The study of comorbidity patterns helps identify underlying vulnerabilities and informs nosological debates about the structure of psychiatric classification systems.
Usage
Usage note: Specify whether referring to concurrent or sequential comorbidity when the distinction is relevant.
In Context
- "Anxiety-depression comorbidity was observed in 45% of the clinical sample." — Results section
- "The high comorbidity rates complicate prevalence estimates when disorders are analyzed separately." — Limitations discussion