What Causes Flatulence and Gas?
All humans have gas in their gastrointestinal tracts. The National Institute of Diabetes and Digestive and Kidney Diseases reports that humans produce approximately one to four pints of gas daily. Odorless gases predominate in the intestine, including hydrogen, oxygen, nitrogen, carbon dioxide and methane. Trace amounts of skatole, indole and hydrogen sulfide produced in the colon have a pungent unpleasant odor. Common causes of increased flatulence are predominantly diet-related.