Gasses can form in your digestive system during a dive. Two common causes are excessive swallowing of air and gas producing foods. This can lead to belching, flatulence, or discomfort during ascent when the gasses expand. This situation is rarely serious, but if these symptoms occur, delay your ascent until the symptoms pass.

You can prevent digestive system problems by avoiding gas producing foods before a dive, minimizing the swallowing of air, and if necessary, taking anti-gas medications before a dive.