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.
Review Date 4/9/2018
Updated by: Michael M. Phillips, MD, Clinical Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.