Doctors used to be one of the wisest, most educated people in a small community where they likely knew everyone. They took their little black bag to your home and got to see how you lived, which gave them vast quantities of knowledge about what ailed you without having to ask a bunch of questions -- more info, in fact, than questions would yield.
Then we invented modern tests and everyone goes to the office or hospital where their machinery is and we get treated like specimens in a petri dish, not like products of our environment and lifestyle.
This is the crux or what's wrong with modern medicine. Also, some doctors don't bother to keep up with new developments in their industry.