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Blind loop syndrome


Blind loop syndrome occurs when digested food slows or stops moving through part of the intestines. This causes an overgrowth of bacteria in the intestines. It also leads to problems absorbing nutrients.

Alternative Names

Stasis syndrome; Stagnant loop syndrome


The name of this condition refers to the "blind loop" formed by part of the intestine that is bypassed. This blockage does not allow digested food to flow normally through the intestinal tract.

The substances needed to digest fats (called bile salts) do not work as they should when a section of the intestine is affected by blind loop syndrome. This prevents fat and fat-soluble vitamins from being absorbed into the body. It also leads to fatty stools. Vitamin B12 deficiency may occur because the extra bacteria that form in the blind loop use up this vitamin.

Blind loop syndrome is a complication that occurs:

Diseases such as diabetes or scleroderma may slow down movement in a segment of the intestine, leading to blind loop syndrome.


Exams and Tests

During a physical exam, the doctor may notice a mass in, or swelling of, the abdomen. Possible tests include:


Treatment most often starts with antibiotics for the excess bacteria growth, along with vitamin B12 supplements. If antibiotics are not effective, surgery may be needed to help food flow through the intestines.

Outlook (Prognosis)

Many people get better with antibiotics. If surgical repair is needed, the outcome is often very good.

Possible Complications

When to Contact a Medical Professional

Call your health care provider if you have symptoms of blind loop syndrome.


Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 142.

Review Date:2/11/2014
Reviewed By:Todd Eisner, MD, Private practice specializing in Gastroenterology, Boca Raton, FL. Affiliate Assistant Professor, Florida Atlantic University School of Medicine. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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Outcome Data

No data available for this condition/procedure.

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