Some types of yuck I can handle; others not so much. Zombies and most surgery? Not really. Swollen, infected limbs? Sure! (I spent a good 15 or more comments on a post at little-details figuring out what sort of infection someone's character could get. It's fun :) )

I'm not a big fan of fake gore in horror movies, but I can deal with, like, gunshot wounds in cop movies. I think the issue is whether I can see internal organs. Then I get squeamish.