Definition of "disease"

There is no overarching, clear definition of what a disease is. On one hand, there is a scientific definition which is tied to a physiological process, and on the other hand, there is the subjective suffering of a patient and the loss of their life quality. Both approaches do not need to match, and they can even be contradictory.

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Source: Unsolved problems in medicine (CC BY-SA 4.0)