Two disorders occurring together in the same person is described as:

1. Disorders frequently co-occur rather than appearing in isolation. 2. Data on this pattern come from a national sample of 9,282 United States residents in the National Comorbidity Survey. 3. The manual notes that 41 percent of people with obsessive-compulsive disorder also meet the diagnostic criteria for major depressive disorder. 4. That overlap between diagnoses is comorbidity. _Source: OpenStax Psychology 2e (CC BY 4.0), Ch 15 'Psychological Disorders', sections 15.1-15.11_