However, those who believe that there are karmic consequences would say that I am being selfish and ignorant about Buddhism because the true Buddhist would not hesitate to help others. They would point out that how could we not be willing to help the poor and needy (seeing others getting sick and not help?)
Yes, doctors do create offenses by healing others. One must pay a price for meddling into others’ karmic retributions. In fact, doctors do end up shouldering their patients’ karmic burdens. Such is the law of cause and effect.
All professions entail creating karmic offenses of one kind or another!
Regardless, you should choose a profession that you are passionate about. The true Buddhist would never hesitate to go into medicine because of fearing karmic consequences. There is a price to pay for doing good: that is the way of the Mahayana Buddhists.
Should you choose to become a doctor, you can go to the temple and learn Dharmas that can help provide protection and mitigate the karmic consequences of your profession. For example, doctors should recite the Medicine Master Mantra or Great Compassion Mantra.