Yes, doctors can get quite focused on the first diagnosis that pops into their minds. This is known as an "attribution error" and can have grave consequences in terms of failing to consider other causes of a patient's symptoms once you focus your mind on the first thing that popped into your mind. We all want to be able to put a name to a patient's symptoms, and it is the name that, while helpful, can be so limiting to the health care provider's ability to see past the nose on their face.
Thanks for commenting. I am certain that when you are in that position you WILL listen to your patient or client, because you are aware of the pitfalls.