comorbidity

In medicine, comorbidity refers to the simultaneous presence of two or more medical conditions in a person; often co-occurring (that is, concomitant or concurrent) with a primary condition. It originates from the Latin term (meaning "sickness") prefixed with ("together") and suffixed with -ity (to indicate a state or condition). Comorbidity includes all additional ailments a person may experience alongside a primary diagnosis, which can be either physiological or psychological in nature. In the context of mental health, comorbidity may refer to the concurrent existence of mental disorders, for example, the co-occurrence of depressive and anxiety disorders. The concept of multimorbidity is related to comorbidity but is different in its definition and approach, focusing on the presence of multiple diseases or conditions in a person without the need to specify one as primary.

== Definition == The term "comorbid" has three definitions: to indicate a medical condition existing simultaneously but independently with another condition in a patient. to indicate a medical condition in a patient that causes, is caused by, or is otherwise related to another condition in the same patient. to indicate two or more medical conditions existing simultaneously regardless of their causal relationship. Comorbidity can indicate either a condition existing simultaneously, but independently with another condition or a related derivative medical condition. The latter sense of the term causes some overlap with the concept of complications. For example, in longstanding diabetes mellitus, the extent to which coronary artery disease is an independent comorbidity versus a diabetic complication is not easy to measure, because both diseases are quite multivariate and there are likely aspects of both simultaneity and consequence. The same is true of intercurrent diseases in pregnancy. In other examples, the true independence or relation is not ascertainable because syndromes and associations are often identified long before pathogenetic commonalities are confirmed (and, in some examples, before they are even hypothesized). In psychiatric diagnoses it has been argued in part that this "'use of imprecise language may lead to correspondingly imprecise thinking', [and] this usage of the term 'comorbidity' should probably be avoided." However, in many medical examples, such as comorbid diabetes mellitus and coronary artery disease, it makes little difference which word is used, as long as the medical complexity is duly recognized and addressed.