You'd be amazed how many different treatments you might get from different doctors for the same condition. I mean if its a common condition, then yes it will be straight forward (ie, strep throat) same as dentistry (ie. cavity). But some conditions are not so straightforward and the doctors might mistake it for something else. This happened to my sister, every doctor tells her a different story. They actually presented her case at a conference. (not a serious illness or anything at all, thank god )