Small Bowel Bacterial Overgrowth
(SBBO; Bacterial Overgrowth, Small Bowel; Small Intestine Bacterial Overgrowth; SIBO; Bacterial Overgrowth, Small Intestine)
by Rebecca J. Stahl, MA
Small bowel bacterial overgrowth (SBBO) occurs when there is a build-up of too much bacteria in the small bowel.
SBBO is often caused by an abnormality in the small bowel. Food is not able to flow properly though the intestines. Conditions that may cause this include:
Risk Factors TOP
Examples of conditions that may increase the risk of SBBO include:
Other risk factors include:
Any condition that affects how food moves through the small bowel may increase the risk of SBBO.
Not all patients with SBBO will have symptoms. But symptoms may include:
SBBO can be difficult to diagnose. The symptoms may be similar to other conditions. Your doctor will:
The goals are to:
Antibiotics are often prescribed to treat SBBO. Usually treatment is temporary. But, in some cases, you may need to take antibiotics for a longer period.
To make sure that you get the proper nutrients, you may need to:
In some cases, tube feeding is needed with a special formula.
For severe cases, surgery may be needed. This is done to correct an abnormality in the small bowel.
If you have any of the conditions that are linked to SBBO, get proper treatment. This may reduce your chance of having a build-up of bacteria in the small bowel.
American Gastroenterological Association
National Digestive Diseases Information Clearinghouse
Canadian Association of Gastroenterology
Canadian Digestive Health Foundation
Aaron S. Malabsorption. EBSCO Health Library website. Available at: http://www.ebscohost.com/healthLibrary/ . Updated September 20, 2010. Accessed May 12, 2011.
Bacterial overgrowth syndrome. Merck Manual website. Available at: http://www.merckmanuals.com/professional/sec02/ch017/ch017b.html . Updated January 2008. Accessed May 12, 2011.
Bures J, Cyrany J, Kohoutova D, et al. Small intestinal bacterial overgrowth syndrome. World J Gastroenterol. 2010;16(24):2978–2990.
Dibaise J, Young R, Vanderhoof J. Enteric microbial flora, bacterial overgrowth, and short-bowel syndrome. University of South Alabama Gastroenterology Continuing Education website. Available at: http://usagiedu.com/articles/sibo/sibo.pdf . Published 2006. Accessed May 12, 2011.
Lactose and glucose hydrogen breath test. Cleveland Clinic website. Available at: http://my.clevelan... . Updated November 25, 2008. Accessed May 12, 2011.
Lin H. Small intestinal bacterial overgrowth. JAMA. 2004;292(7):852-858.
McCoy K. Short bowel syndrome. EBSCO Health Library website. Available at: http://www.ebscohost.com/healthLibrary/ . Updated September 20, 2010. Accessed May 12, 2011.
Parrish C. Nutritional consequences of small intestinal bacterial overgrowth. University of Virginia, School of Medicine website. Available at: http://www.medicin... . Published December 2008. Accessed May 12, 2011.
Small bowel bacterial overgrowth—another cause for IBS symptoms. Tennessee Society of Gastroenterology Nurses and Associates website. Available at: http://www.tsgna.o... . Accessed May 12, 2011.
Small bowel bacterial overgrowth overview. Cleveland Clinic website. Available at: http://my.clevelan... . Accessed May 12, 2011.
Vanderhoof J, Young R. Bacterial overgrowth. The Oley Foundation website. Available at: http://www.oley.org/lifeline/bacter.html . Accessed May 12, 2011.
Vanderhoof J, Young R, Murray N, Kaufman SS. Treatment strategies for small bowel bacterial overgrowth in short bowel syndrome. J Pediatr Gastroenterol Nutr. 1998;27(2):155-160.
Last reviewed September 2013 by Daus Mahnke, MD
Last Updated: 9/30/2013