Some of this will reiterate "third year gems" already mentioned:
1) NEVER try to one-up your classmates. NEVER answer a question that's been asked of someone else, unless you are asked directly afterward by an attending. NEVER gossip about your classmates, whether it's with residents, attendings, or other classmates. These things will end up making YOU look bad. In contrast, if you are always kind, positive, and willing to help your classmates out, it bodes well for you.
2) This is something you learn with time, but it's important nevertheless: Work hard, but know when to go home. I read on this site several years ago that you should ask once if your help is needed (at the end of the day, of course). If they say "no, go home," then do jus that. This was very good advice. There are times when medical students are, frankly, in the way and irritating for the residents, and getting out of their hair can be a blessing. Besides, you'll need your rest and time to study.
3) Keep very good track of your patients. I made forms for each patient, with room for several days' notes. You should have a list in front of you with each patient's medical history, daily vitals, meds and med changes, imaging results, laboratory data, active issues, disposition planning info, "to do" boxes to check off (so you don't forget to do anything), etc. That way, when the attending grabs you because she can't find the intern, you'll be on your toes, not only with that day's info, but with the past few days' info.
4) Get to know your patients personally--what do they like to do? What is their career? These types of interactions mean a great deal to patients and "humanize" a hospital stay.
5) Always make sure your patients are comfortable. Remind them that if they have pain, they need to ask for pain medicine. Ask if there's anything you can get them--slippers, bed pans, extra pillows, etc. These small things make a great difference in patient comfort
Also, you'll find that many medical things are not adequately explained to your patients. You have lots of time, so make sure they understand what studies have shown (as long as it's okay by the attendings/residents to divulge--you don't want to be the first one telling them they have terminal cancer, because you're not adequately prepared to answer questions), what the plan for the day is, what to expect, what medications they are on and why, etc.
6) Always be around OR let your resident know where they can find you. During down time, I tried to study within close proximity to the floor I was working on, so my residents wouldn't be fuming, "Where is she?!?"
7) This is a lesson taught to me by a very wise medicine tutor: If you have study results (e.g., Echo, radiology, etc) go to the experts to have them teach you about it! Have them review the actual Echo video with you (or go to watch when your patient goes for the study), have them go through the xray with you, go to the lab and look at urine sediment, you get the idea. It takes a bit of tenacity and perserverance on your part, but you learn SOOO much more than if you just read the results. AND, you make acquaintances all throughout the hospital. When asked to go fetch something, you'll know your way around and will be back within minutes!
8) When presenting patients at rounds, have all pertinent data available--including radiology studies (either in film or pulled up on the computer). Also make sure you've reviewed as much as you can about their disease.
9) Always volunteer to do a procedure, or learn one. If in Ob-gyn clinic, volunteer to do every pap smear. Be excited about deliveries, even if it's 3 am. In neuro, beg them to let you do an LP. In surgery, make sure they know you want to suture and make incisions. You'll have a lot more fun, and you'll look like you've got initiative. (BUT, only ask in appropriate situations, as well...use your judgment).
10) Work really hard, and don't EVER complain.
11) Be dependable. Follow-up all of your patient studies. Make sure everything that needs to be done is done. Finish, with excellence, anything asked of you. If you become indispensable, you'll receive a great evaluation. And, you'll get more responsibility, so you learn more.
12) Memorize the location of every vending machine in the hospital, and always have at least a dollar or two in change in your coat pocket. You'll be grateful for this on surgery and ob-gyn. AND, don't eat chips. Buy peanuts or something that will stick with you. Also, I bought granola bars and stuffed them in my coat pockets for hunger emergencies. In spite of this, I lost 5 pounds on 6 weeks of Ob-Gyn, and I'm not that big to begin with!
13) Use the stairs instead of the elevator. It's faster, and you'll get some exercise during those days you simply can't muster the energy to work out once you get home.
14) Read, read, read, read, read, read, read......
Good luck! 🙂