-able to withstand thirst and hunger
-big bladder capacity
-don't mind getting splattered by blood, urine, bone debris, rotting necrotic flesh, sometimes right onto your face
-you will likely get poked by needles at some point, God forbid, from pts with HIV, hep B, Hep C, or some mysterious disease we have yet to discover
-don't mind inhaling that electrocautery smoke all day (basically smell of human flesh BBQ, but has been shown to transmit viral particles. VERY UNHEALTHY STUFF!)
-able to stand for long long time
-be workaholic, can tolerate lack of sleep
-don't get jealous of the anesthesiologist, who will be chilling on a comfy chair while you are 5 hrs into a case and have 3 more hrs to go
-get ready to handle some nasty verbal abuse by your surgical attendings
-educate yourself on the decreasing reimbursement issues, lawsuits, malpractice