"Comorbidity" refers to the presence of two or more medical conditions or diseases in a person at the same time. It means that someone has multiple health problems or illnesses occurring together. Full definition
Rates and Patterns of Comorbidity of Adolescent Behavioral Syndromes as Reported by Parents and Teachers in a Taiwanese Nonreferred Sample. (cambridge.org)
154 people aged 18 — 44 years who participated in the US National Comorbidity Survey Replication study. (ebmh.bmj.com)
This report presents preliminary results of the latter type of analysis based on the US National Comorbidity Survey Replication Adolescent Supplement (NCS - A). (cambridge.org)