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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.
In addition, individuals who experience anxiety may swallow air excessively. Poorly fitting dentures and chronic postnasal âdripâ can also cause excess air swallowing. As a result, significant amounts of gas can enter the stomach and small bowel in 24 hours which can lead to belching, bloating or flatulence.