cause of very smelly gas
Facts about flatulence (gas), excessive, and chronic. 1  The definition of flatulence or intestinal gas is the state of having excessive stomach and/or intestinal gas (waste gas produced during digestion) that is usually released from the anus with sound and/or odor. Causes of excess gas in the digestive tract are swallowed air, breakdown of undigested foods, lactase intolerance, and.