Gas is formed in the intestines by the action of bacteria as food is being digested. Gas is also called flatus or flatulence, and is passed through the intestine and out the body through the rectum.
Update Date 5/15/2014
Updated by: Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-Torresdale Hospital, Aria Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.