Nurse and doctor are not very good when you consider that nurses are not paid that well (unless you are an RN or a specialty nurse), and doctors earn pay comparable to plumbers when you consider the opportunity cost of going to college/being in training until your mid-30s. This is in the US.
It's often much more profitable from a payoff/effort ratio to become something like a Physician's Assistant / Nurse / Lab Tech than to become an actual Doctor nowadays.