excess gas from human body.irritable bowel syndrome ibs in a large intestine

abdomen abnormality alimentary attack bacillus background bacteria bacterial bacterium bad body bodyirritable bowel burp colon diagnosis digestion digestive disease excess fermentation gas gastrointestinal gut health healthy human ibs icon illness illustration infection internal intestinal intestine irritable large medical microbe microbiology microflora microscopic organ overgrowth pain problem sibo spasm syndrome system tract upset vector white