I hate to diagnose people online, but does this (and half of vistaril's other posts) sound like splitting?
I agree that you don't HAVE to listen and question them, but it doesn't hurt. The reason I gave the example of clozapine-induced myocarditis is because I once saw a patient at ~3pm with that sort of presentation, and they'd consulted psych because they wanted us "on board" due to the patient's history of psychosis. The patient's presumptive diagnosis (from an inpatient psych unit) was pneumonia and he was on contact precautions. They'd ordered an echo, but I was the first person to see it because it was later in the day and the result had just come back. Cardiology and ID hadn't considered clozapine-induced myocarditis, and it was the C/L psych team that made the diagnosis. We would have stopped the clozapine either way, but it saved the patient from a few days of contact precautions and unnecessary treatment for pneumonia. I'm sure we could have made the diagnosis without listening to his lungs and his heart, but it helped.
I can tell you a similar story about a lady with macrocytic anemia due to alcohol use. She had normocytic anemia with mildly increased RDW, and she denied ever drinking alcohol. I went down to the hematology lab to look at the blood smear, and it was clear that she had both macrocytes and microcytes with no megaloblasts - classic picture of iron deficiency combined with alcohol-related anemia, which didn't show up on the CBC because the microcytes and macrocytes cause the MCV to average out. Because of that blood smear, we were able to be very certain that she was lying about her alcohol use, and when she heard that one of the blood tests showed signs of heavy alcohol abuse, she fessed up.
The point is - you don't have to use general medical skills in psychiatry, but it can help in some situations.