Gas is a natural byproduct of digestion, caused by swallowing air as we eat and other processes in the body. However, the pressure in the cabin caused by being at such a high altitude makes any air trapped in your gut expand, which causes you to feel bloated after a flight.

Yes, "jet belly" is a scientifically proven phenomenon caused by Boyle's Law. As a plane climbs and the cabin pressure decreases, the air trapped inside your digestive tract expands (by up to 30%). This causes that tight, uncomfortable, or "gassy" feeling in your stomach. In 2026, we also know that the extremely dry cabin air (often less than 10% humidity) slows down your digestion, making it harder for your body to move gas along. To minimize this, you should avoid carbonated drinks, as they add even more gas to an already expanding system. A supportive peer tip: try to walk the aisle every hour to help "move" the gas, and wear loose-fitting clothing. Avoid "gas-forming" foods like beans or broccoli for 24 hours before your flight. Many 2026 frequent flyers also use simethicone (Gas-X) or digestive enzymes during long-haul flights to help break up the bubbles before they become painful.