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Bacteria May Be The Cause Of Irritable Bowel SyndromeScienceDaily (Sep. 3, 2004) — The enigmatic-but-common condition known as irritable bowel syndrome, or IBS, is caused by an overgrowth of bacteria in the small intestine, a USC researcher has proposed in the Journal of the American Medical Association.--------------------------------------------------------------------------------See Also:Health & Medicine •Colitis •Gastrointestinal Problems •Today's Healthcare Plants & Animals •Bacteria •Microbes and More •Microbiology Reference•Irritable bowel syndrome •Diarrhea •Constipation •Salmonella infection Researchers have suggested numerous theories to explain IBS, which affects as many as 36 million Americans. But according to gastrointestinal motility specialist Henry C. Lin, associate professor of medicine in the Keck School of Medicine of USC, the idea of a bacterial origin of IBS represents a major change in thinking. Writing in the Aug. 18 issue of JAMA, Lin proposed that ordinary bacteria normally confined to the large intestine may expand into the small intestine, prompting uncomfortable bloating and gas after meals, a change in bowel movements as well as an immune response that may account for the flu-like illness so common in the IBS patient, including such debilitating symptoms as headaches, muscle and joint pains and chronic fatigue. "IBS has long been a frustrating diagnosis for both patients and their physicians," Lin said. "The bacterial hypothesis of IBS offers new hope for suffering patients by providing a new framework for understanding the symptoms of this disorder, pointing to new strategies for treatment." Physicians frequently diagnose a patient with IBS when ongoing symptoms - including diarrhea, constipation, bloating, gas and abdominal pain - are not explained by medical tests such as gastrointestinal endoscopies. For more than a dozen years, Lin has searched for a common thread to account for the symptoms in IBS. Studies indicate 92 percent of IBS patients report bloating after they eat, a symptom he saw again and again in his patients. While many physicians believe that IBS-related bloating is perceived and not real, Lin noted that recent studies of IBS patients show that their abdomens do become measurably more distended than those of healthy patients. With the symptom of post-meal bloating in mind, Lin began the quest for the cause of IBS by considering the problem of increased intestinal gas. Gas comes about when gut bacteria ferment food in the intestinal tract. There are plenty of organisms in the gut, where bacteria may number 100 trillion. Bacteria perform a variety of valuable services in the large intestine, according to Lin. "But we believe problems may start when bacteria set up shop in the small intestine where they are normally scarce. Usual medical tests such as endoscopy cannot detect this problem in most patients," he said. However, a breath test can be used to indirectly tell if too many bacteria are in the small intestine. In this test, the patient ingests a syrup containing the sugar lactulose. Over the next three hours, the gaseous products of bacterial fermentation of this sugar may be measured in the exhaled breath. In a 2003 paper authored by Lin and his research partner Mark Pimentel of Cedars-Sinai Medical Center, 84 percent of IBS patients were found to have abnormal breath test results suggesting small intestinal bacterial overgrowth. In this double-blind, placebo-controlled study, patients received either antibiotic therapy or a sugar pill. Patients whose small intestinal bacterial overgrowth was eradicated by antibiotics reported a 75 percent improvement in symptoms. Small intestinal bacterial overgrowth allows gut bacteria to cross the mucosal barrier, which is the lining of the gut, and enter the body. This activates the patient's immune system as evidenced by increased numbers of inflammatory cells in tissues of IBS patients. "The immune response to bacterial antigens may then explain the flu-like symptoms that can greatly diminish the quality of life such as chronic fatigue and pain," Lin said. The Jill and Tom Barad Family Fund supports Lin's current bacterial overgrowth research. His other research projects are supported by the National Institutes of Health.Recommend this story on Facebook, Twitter, and Google +1: Other bookmarking and sharing tools: | More --------------------------------------------------------------------------------Story Source:The above story is reprinted from materials provided by University Of Southern California. Note: Materials may be edited for content and length. For further information, please contact the source cited above.--------------------------------------------------------------------------------Need to cite this story in your essay, paper, or report? Use one of the following formats: APA MLA University Of Southern California (2004, September 3). Bacteria May Be The Cause Of Irritable Bowel Syndrome. ScienceDaily. Retrieved February 4, 2012, from http://www.sciencedaily.com­ /releases/2004/09/040903093237.htmNote: If no author is given, the source is cited instead.Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.--------------------------------------------------------------------------------Crohn 's Disease? — The Canadian Government Is Offering Disability Credits Up To $35,000www​.​The​N​B​A​.caWindows Azure — Discover Microsoft® Windows Azure. Learn About A Free 90-Day Trial!www​.windowsazure​.comProblem Foods Identified — The food intolerance test used by Doctors in Canada.www​.canlabs​.caID over 2500 species — Fast I.D. of over 2500 species of aerobic and anaerobic bacteria.www​.biolog​.comShort Healthcare Courses — HighDemand for Health Professionals Day or Evening Classes Availablewww​.​Academyof​Learning​.com​/​HealthRelated Stories--------------------------------------------------------------------------------Patients With Irritable Bowel Syndrome Not More Likely to Develop Polyps, Colon Cancer (Mar. 22, 2010) — Patients with irritable bowel syndrome are at no greater risk of having polyps, colon cancer or inflammatory bowel diseases than healthy people undergoing colonoscopies, according to a new ... > read moreAllergic Disease Linked To Irritable Bowel Syndrome (Jan. 31, 2008) — Adults with allergy symptoms report a high incidence of Irritable Bowel Syndrome, suggesting a link between atopic disorders and IBS according to a new study in the Annals of Allergy, Asthma & ... > read moreIrritable Bowel Syndrome: Common Gastrointestinal Disorder Linked to Bacterial Overgrowth, Food Poisoning (May 13, 2011) — Researchers have reported two advances in the understanding of irritable bowel syndrome, the most common gastrointestinal disorder in the United States, affecting an estimated 30 million people. One ... > read moreProof That a Gut-Wrenching Complaint -- Irritable Bowel Syndrome -- Is Not in Your Head (Aug. 20, 2010) — Irritable bowel syndrome makes life miserable for those affected, an estimated ten percent or more of the population. What further irritates many sufferers is that they often are labeled as ... > read moreThe Overlap in Gastroesophageal Reflux Disorder and Irritable Bowel Syndrome (Mar. 31, 2010) — A research group in Iran investigated the prevalence of overlapping gastroesophageal reflux disorder (GERD) and irritable bowel syndrome(IBS) in patients referred to a gastroenterology clinic over a ... > read moreSearch ScienceDailyNumber of stories in archives: 114,534--