Balantidiasis is a rare intestinal infection caused by the bacterium, Balantidium coli, a single celled parasite (ciliate protozoan) that frequently infects pigs but on occasion (rarely) infects humans. Some infected people may have no symptoms or...

If frequent gas has you concerned, it may help to know what's happening in your body. Do you constantly burp, pass gas, or feel bloated? The body naturally produces gas, and produces even more if you eat certain foods, particularly...

Intestinal gas, a buildup of air in the digestive tract, is usually not noticed until you burp or pass it rectally (flatulence). The entire digestive tract, from the stomach to the rectum, contains intestinal gas as the natural result of swallowin...