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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.
Fifty percent of gas is caused by swallowing too much air. Here are a few common activities that can cause you to swallow too much air and may lead to problems with gas: 1  Chewing gum. 2  Sucking on candies or food. 3  Eating or drinking very quickly. 4  Wearing dentures that are too loose. 5  Smoking.