Well, that. Ordering blood tests, I suppose.
If you need a bone set or surgery of some kind, they are trained in it.
But when it comes to something out of the ordinary, FORGET IT! They do not know how to investigate it or treat it outside of their big pharma trained medical procedure.
In my 65 years adult years in USA, I must have seen 25+ doctors. I can’t remember anyone asking me about my diet or my exercise habits. Those 2 factors affect health the most.
I guess doctors will go out of business if people were very healthy.