Presence of a second disease or condition influencing the care or treatment of a patient, and in the hospital setting is expected to increase the length of stay by at least one day for most patients.

Two or more diseases or conditions existing together in an individual.

See co-existing disorders.

The simultaneous existence of two or more disorders in the same person

The presence of coexisting or additional diseases with reference to an initial diagnosis. Comorbidity may affect the ability of affected individuals to function and also their survival; it may be used as a prognostic indicator for length of hospital stay, cost factors, and outcome or survival.

Coexistence of a disease or diseases in a study participant in addition to the index condition that is the subject of study. ( Harm)

The presence of two or more disorders at the same time. For example, a person with depression may also have co-morbid obsessive compulsive disorder.

Any disease that is associated with, or a result of, another disease. Co-morbidities of obesity include diabetes, hypertension and high cholesterol. For a more complete listing, click here.

Relative incidence of disease(s).

the presence of several diseases/conditions.

Two or more diseases or conditions occurring at the same time, such as anxiety disorder and depression.

A person diagnosed as having an alcohol or drug abuse problem in addition to some other diagnosis, usually psychiatric, for example, mood disorder and schizophrenia. Can also refer to a person with chronic physical and mental health problem. Making a different diagnosis is often complicated by overlapping signs and symptoms ofdependence and diagnostic entities, eg anxiety is a prominent feature of drug withdrawal. A further complication is with shared or reciprocal causal processes, eg a mild disorder of mood leads to some drug use which eventually leads to an exacerbation of the mood disturbance to further drug use, dependence and severe mood disturbance.