A medical student, I'm still pretty amateur in the field, as such, i might not be accurate on what i'm going to mention.

-As to diseases, make a habit of two things - to help, or at least, to do no harm" By Hippocrates. 


Primum Non Nocere - the first principle taught in medical school.

How many doctors out there actually practising it? How many seniors out there are actually guiding the juniors to avoid harm to patient? How many healthcare systems out there actually set up to do no harm to patients?

Another random issue :-
Helping people, doing good thing ≠ you will receive similar amount that you have been given in.
    I have acknowledged this principle since the first year of medical school. No matter in friendship, relationship, family, studies... whatever you do in this world, there is rarely equal amount in return. Don't get to frustrate about it. It just how it works. A little expansion on the fact. Medicine is a field, where you require huge investment at first, then a life-long commitment to your work. I remember in my lecture last week, maybe in aussie or some other country where there is law that all doctors, including psychiatrist are obliged to help in emergency situation.  Pls think carefully before you enter this course. Especially to those who live in a society where they value doctors as being the high class job, easy $$$, easy job, genius with knowledge on everything. wtf??! It's actually the opposite. Talk to someone else if you unsure.