There is no vaccine against traveler's diarrhea. Your doctor may recommend medicines to help lower your chances of getting sick. Taking 2 tablets of Pepto-Bismol 4 times a day before you travel and while you are traveling can help prevent diarrhea.
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If you get diarrhea, drink lots of fluids to stay hydrated. In serious cases of travelers' diarrhea, oral rehydration solution—available online or in pharmacies in developing countries—can be used for fluid replacements.
Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.
Make sure your pre-travel diet includes plenty of fiber, which makes stools softer and more comfortable to pass. Foods high in fiber include many fruits, like apples (with the skin), raspberries, and pears; beans; and whole-grain foods such as bran cereal.
On long-haul flights, changes in cabin pressure during take-off and landing can lead to health problems. Air pressure in the cabin is lower than at sea level. As cabin pressure falls while flying, gas starts to expand. As a result, you may feel pressure in your stomach or digestive system.