In medicine, comorbidity (literally "additional morbidity") is either: The presence of one or more disorders (or diseases) in addition to a primary disease or disorder; or The effect of such additional disorders or diseases. The term dual diagnosis is often applied to the comorbid existence of both a mental disorder and a developmental disability. Comorbidity in medicine In medicine, comorbidity describes the effect of all other diseases an individual patient might have other than the primary d… (More on Comorbid)