Physicians are human and subject to their own biases and mistakes. I could go on about how helpful patient/nursing/midlevel input is and has been to me personally in my career. But the point I'm trying to make here is that the shallow vs deep thinking shows up in medicine at obvious points and causes problems.
We also have our own biases. That physician has probably seen 100s of patients who have self-diagnosed something that turned out to be wrong, whereas the physician is usually correct about diagnoses. In this instance, the self-diagnosis was correct and the physician was wrong, but I would bet this is the exception, rather than the rule.
