Jon Woellhaf writes:

I believe the third class medical -- or even the first class medical --
provide no assurance whatsoever that you won't have a heart attack on the
way from the doctor's office to your car.

There have been cases of airline pilots dying suddenly in the cockpit from
severe cardiovascular disease even though they had passed their stringent
medicals. The medicals worry too much about some things while ignoring
others.