You're probably looking forward to some R & R on your vacation, not coming down with some kind of digestive distress. But between all the changes in routine, the hot weather, and the festive eating and drinking you'll be doing, you can end up with a major case of gastrointestinal upset. "People look at summer vacations as a time to get away, relax, and enjoy themselves but too often these can be spoiled by gastrointestinal illnesses," says Cindy Yoshida, M.D., a gastroenterologist in Charlottesville, Virginia, and author of No More Digestive Problems. "Prevention is the key but if you get stuck with one of these GI problems, luckily most are short-lived and relatively easy to treat." Find out how to protect yourself so stomach problems don't wreck your vacation.