Doctors look at individual patients and decide if they are ill, if there is any treatment, and the risk:benefit ratio of treatment
Aviation authorities look at risk to third parties and are concerned at the likelihood of sudden incapacitation in the future. If there is a doubt, they will err on the side of caution.
So it is important that the two liase so the two can agree pathology (if any) and risk. This may still result in you having no license but needing no treatment, and indeed being for all other purposes 'healthy', but it does optimise your chances of getting your medical