Doctors may seem like modern-day miracle workers, but truth be told, they do not know everything. Doctors are not born knowing everything there is to know about medicine; they are taught. And with the new developments in medicine that occur every year, it would be hard for them to know everything. Patients are often given the run-around by doctors. A doctor will examine you and then send you off to a specialist for further analysis. Of course they'll tell it's to ensure their diagnosis is correct, but it's more than likely because they have no idea what's going on with you.