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 physic

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.