<p>Yeah, I think you’re definitely allowed to drop in and ask questions - but use common sense. Like if you go to the prof’s office hours, and he’s busy dealing with students in the actual class who need help, leave. But if you show up and he/she’s not that busy, then I don’t think it’s rude to ask a question. Sometimes I need help in a class and I’ll go to the dept and my professor won’t be there, so I’ll ask a random professor in that dept who’s free for help and it’s fine. I’ve also asked random profs about their research because i wanted to work in their labs or whatever. </p>
<p>As for doctors/nurses, they’re generally very busy. In my college there is the medical center which consists of various hospitals, but there is also a “Health Center” specifically for students where we’re supposed to go when we’re sick, and that’s where I would go if I had a question. I would only go to the hospital if I had an emergency or was very sick. Plus my college’s hospital is very busy since it’s in NYC and I assume Chicago is the same.</p>