Ye Yao Zu and I once had a long discussion on the idea of 'do no harm'. It was one of the days that he, Si Dong, Fan Teng Fei, and Cheng Bo Jing were just lounging around the house, waiting for Bai Long Qiang to come back from the base.
Those days seemed to happen several times a week to the point where I looked forward to them. They were the only friends I really had in this life.
Anyways. I thought it was pretty straightforward: 'Do no harm' meant don't do anything to cause the person in your care any harm.
Ye Yao Zu argued that the phrase meant that the doctor needed to do what was in the patient's best interest, whether the doctor agreed with it or not.
Case in point: setting a dislocated shoulder or a broken bone caused the patient to experience more pain, but when the treatment was over, they would be better.