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Mechanical Bowel Obstruction
by Editorial Staff and Contributors
A mechanical bowel obstruction is a partial or complete blockage in the intestine. It can happen at any point along the intestine tract but it is more common in the small bowel. The small bowel is the upper part of the intestines and the large bowel is the lower part.
When the bowel is blocked, food and liquid cannot pass through. Over time, food, liquid, and gas build up and cause pressure and pain. Some obstructions, when left untreated, can cut off the flow of blood to the intestine. This can lead to death of the intestine tissue and serious illness.
The bowel is a muscular tube that is constantly moving to push food through. Blockage may be caused by something blocking the inside of the tube or something that stops the intestine from working well.
Most small bowel blockages are due to scar tissue. This tissue connects the bowel to the abdominal wall or other organs. This makes it hard for the bowel to work as needed. Most large bowel obstructions are caused by tumors.
Other causes of bowel obstructions include:
Risk Factors TOP
A number of intestinal conditions can increase the risk of a bowel obstruction such as:
Symptoms of a bowel obstruction include:
You will be asked about your symptoms and medical history. A physical exam will be done. A stethoscope will be placed on your abdomen to listen for bowel sounds. Absent, or abnormal signs may suggest a bowel obstruction.
Images will be needed to confirm the obstruction. This can be done with one or more of the following:
Bowel obstructions can be serious, even fatal. It will need hospitalization to provide support such as:
The plan to remove the blockage will depend on where it is and what is causing it. Possible treatments include:
Prevention of bowel obstruction depends on the cause. Some bowel obstructions cannot be prevented. The following actions may help reduce your risk of a bowel obstruction:
American College of Gastroenterology
National Institute of Diabetes and Digestive and Kidney Diseases
The College of Family Physicians of Canada
Abdominal adhesions and bowel obstruction. University of California, San Francisco website. Available at:
...(Click grey area to select URL)
Accessed December 18, 2014.
Acute intestinal pseudo-obstruction. EBSCO DynaMed Plus website. Available at: http://www.dynamed.... Updated July 12, 2014. Accessed December 18, 2014.
Jackson P, Raiji M. Evaluation and management of intestinal obstruction. Am Fam Physician. 2011;83(2):159-165.
Last reviewed December 2016 by Daus Mahnke, MD
Last Updated: 3/20/2017
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