Do we have a right to know if the potential leader of our country is in good health? Absolutely.
Why? Do you realize it is straight up illegal in this country to discriminate against someone because of disabilities, whether transitory or chronic, when hiring employees? Considering the president is basically like hiring an employee, why on earth should this be acceptable for a presidential race when it is illegal for everything else? Do you, and the other folks who think they have a right to private medical records so they can engage in currently illegal discrimination, want to repeal the ADA?