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Some other causes for excess gas include: 1  Irritable bowel syndrome. 2  Gastroesophageal reflux disease (GERD) 3  Lactose intolerance. 4  Fructose intolerance. 5  Malabsorption problems. 6  Celiac disease. 7  Stomach illness (such as food poisoning) 8  Small intestinal bacterial overgrowth.
When excess air is swallowed it will be passed as a belch or gas, or return to the stomach, where it can cause bloating. Normally, about half of passed gas comes from swallowed air, but when too much air is swallowed this amount increases.