 ##  [Comorbidity](/comorbidity) 

  ##  [Comorbidity](https://health.quantumdictionary.io/comorbidity-0) 

  
 [![Health & Life Sciences Dictionary](/sites/default/files/styles/large/public/2026-01/Health%20%26%20Life%20Sciences.png.webp?itok=yyyaiQOY)](/topic-specific-dictionaries/health-life-sciences)


**Health &amp; Life Sciences Dictionary**

 
Definition

The co-occurrence, in a single individual, of one or more additional diseases or disorders that are recorded or considered in relation to a specified primary (index) disease or condition; the term denotes a relational status anchored to that index condition rather than an unordered set of simultaneous illnesses.