Power
There's power to be found in this field, but it only comes after a long fourteen years as an underling, which often involves feelings of profound powerlessness. But hey, once you get that title of nephrologist, there'll be a ton of other med students trying to butter you up. Sound good?
Good, because once you get to the point where you have power, you'll also have a lot of responsibility and stress. If you skim a patient's chart and tell an underling your opinion, they're going to listen to you. That means if you're wrong, a patient could suffer. That's real power right there―people being affected by your decisions, for better or for worse.