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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.
If too much the excess acidity can directly lead to symptoms, however too little stomach acid can lead to decreased digestion of food, which then is digested further by bacteria in GI track which results in the production of gas which causes indigestion.