Gut gas expands as cabin pressure falls, hours of sitting slow your digestion, and fizzy drinks plus salty plane food add more.
The NHS lists fizzy drinks and known gas-producing foods among bloating causes. The fixes: water instead of carbonated drinks, no gum, light meals, hourly aisle walks, and skipping beans, cabbage, and lentils before flying. Bloating lasting days after landing, or arriving with pain, vomiting, or bowel changes, is no longer a flight story; the NHS says frequent or persistent bloating should be checked.
What to do
Common questions
Why do I get bloated when I fly?
Three things stack up in the air. First, physics: the gas in your gut expands as cabin pressure drops during ascent, so whatever air you boarded with takes up more room by cruising altitude. Second, stillness: sitting for hours slows gut motility, so gas and contents move through more slowly instead of passing. Third, what you consume: fizzy drinks add gas directly, and the NHS lists them among the causes of the most common kind of bloating; salty plane meals and snacks promote water retention on top. The fixes map cleanly: skip carbonated drinks and chewing gum on board (swallowed air again), choose water, walk the aisle every hour or two and do seated calf pumps and gentle twists, eat lightly before and during the flight, and go easy on gas-producing foods like beans, cabbage, and lentils in the airport meal, which the NHS names as known gas producers. Loose waistbands are not defeat, they are equipment. Bloating that persists for days after flying, or comes with pain, vomiting, or a change in bowel habit, is not cabin pressure anymore; the NHS says frequent or persistent bloating deserves a GP check.