Comorbidity is the simultaneous existence of two or more diseases, illnesses, or other medical conditions.

Morbidity is a term that describes the patient as being in a diseased state, disabled, or in otherwise poor health due to any unspecified cause. It can also be used as a term to define the existence of any form of disease, as well as used to measure the degree to which the disease affects the patient. 

Morbidity

https://en.wikipedia.org/wiki/Disease#:~:text=There%20are%20four%20main%20types,diseases)%2C%20and%20physiological%20diseases.

Disease

Comorbidity

Morbidity rate / morbidity frequency is a measurement of morbidity that is primarily used in epidemiology or actuarial science. Measuring morbidity can refer to either the incidence rate of a disease / condition, or the prevalence of a disease / condition that occurs within a specified population and time range. 

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