What is Decrease in Medical Fitness (DMF) and how do I know whether I need to report it?

A CAAS licence holder who knows or has reason to believe that his/ her physical condition renders him/her temporarily unfit to perform any of the functions to which his/her licence relates as spelt out in Para 20(7) or Para 62(E) of the Air Navigation Order, will need to report DMF to CAAS.
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