Medicine has made some great strides in recent history. I would have died probably twice if I would have been born 100 years earlier.
Modern medicine in many ways is also weakening the human race by treating symptoms and not curing the problem. Interfering with natural selection allows many of these problems to be transmitted to our offspring.
The body is very complicated but also many things are kept secret to the trade because they are easy to understand. Being a doctor to me is another trade that someone chose to do. People that drop out of veterinary school become human doctors!;)
One time I was talking to a guy that was into designing an artificial heart. I asked him what the big deal was to make a pump that pumped so many GPM. I was thinking more of destroying blood cells in the pump. When he started talking about how the body uses the pulsing motion of the heart to operate it made much more sense and since I know just enough to be dangerous I am not looking into designing an artificial heart!