Health Encyclopedia

Irritable bowel syndrome

Definition

Irritable bowel syndrome (IBS) refers to a complex disorder of the lower intestinal tract. It is mainly characterized by a pattern of symptoms that is often worsened by emotional stress.

It is not the same as inflammatory bowel disease (IBD), which includes Crohn's disease and ulcerative colitis.

Alternative Names

Nervous indigestion; Spastic colon; Intestinal neurosis; Functional colitis; Irritable colon; Mucous colitis; Laxative colitis; IBS

Causes, incidence, and risk factors

Irritable bowel syndrome involves a combination of abdominal pain and alternating constipation and diarrhea. There are many possible causes. For instance, there may be a problem with muscle movement in the intestine or a lower tolerance for stretching and movement of the intestine. There is no problem in the structure of the intestine.

Irritable bowel syndrome (IBS) can occur at any age, but often begins in adolescence or early adulthood. It is more common in women. Risk factors may include a low-fiber diet, emotional stress, use of laxatives, having had infectious diarrhea, or other temporary bowel inflammation.

Irritable bowel syndrome is extremely common, but only a small number of people seek treatment.

Symptoms

Chronic and frequent diarrhea, usually accompanied by pain
Chronic and frequent constipation, usually accompanied by pain
Abdominal pain or tenderness
- Following meals
- Relieved by bowel movement
- Intermittent
Abdominal fullness, gas, bloating
Abdominal distention
Nausea and vomiting
Loss of appetite
Emotional distress
Depression

Signs and tests

Tests usually reveal no problems. Not all patients require endoscopy, especially if symptoms begin early in life and have been stable. However, patients who have irritable bowel symptoms beginning later in life usually require endoscopy.

Younger patients with persistent diarrhea may require endoscopy to look for inflammatory bowel disease (Crohn's disease or ulcerative colitis). Irritable bowel syndrome, by contrast, is not an inflammatory condition, but the symptoms may be very similar to those of inflammatory bowel disease.

Patients over age 50 should be screened for colon cancer.

Treatment

The goal of treatment is to relieve symptoms. Changes in diet may help relieve symptoms in some patients. No diet works for all patients.

Increasing dietary fiber and avoiding items that stimulate the intestines, such as caffeine, may help. Other possible treatments may include:

Anxiety-reducing measures, such as regular exercise
Anticholinergic medications before meals
Counseling (in cases of severe anxiety or depression)
Anti-diarrheal medications
Low-dose antidepressants

Expectations (prognosis)

Irritable bowel syndrome may be a life-long chronic condition, but symptoms can often be improved or relieved through treatment.

Complications

Discomfort
Dehydration
Malnutrition resulting from food avoidance
Depression

Calling your health care provider

Call your health care provider if you have symptoms of irritable bowel syndrome or if you notice a persistent change in your bowel habits.

Review Date:7/25/2006
Reviewed By:Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-TorresdaleHospital, Jefferson Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network.

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