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Inflammatory Bowel Disease (IBD)

Facts and definition of inflammatory bowel disease (IBD)

  • The term inflammatory bowel disease (IBD) covers a group of disorders in which the intestines become inflamed (red and swollen), probably as a result of an immune reaction of the body against its own intestinal tissue.
  • Two major types of IBD are ulcerative colitis (UC) and Crohn's disease (CD).
  • Ulcerative colitis is limited to the colon (large intestine).
  • Crohn's disease can involve any part of the gastrointestinal tract from the mouth to the anus, it most commonly affects the small intestine and/or the colon.
  • Both ulcerative colitis and Crohn's disease usually run a waxing and waning course in the intensity and severity of illness. When there is severe inflammation, the disease is considered to be in an active stage, and the person experiences a flare-up of the condition. When the degree of inflammation is less (or absent), the person usually is without symptoms, and the disease is considered to be in remission.

What causes inflammatory bowel disease (IBD)?

Researchers do not yet know what causes inflammatory bowel disease. Therefore, IBD is called an idiopathic disease (disease with an unknown cause).

An unknown factor/agent (or a combination of factors) triggers the body’s immune system to produce an inflammatory reaction in the intestinal tract that continues without control. As a result of the inflammatory reaction, the intestinal wall is damaged leading to bloody diarrhea and abdominal pain.

Genetic, infectious, immunologic, and psychological factors have all been implicated in influencing the development of IBD.

There is a genetic predisposition (or perhaps susceptibility) to the development of IBD. However, the triggering factor for activation of the body’s immune system has yet to be identified. Factors that can turn on the body’s immune system include an infectious agent (as yet unidentified), an immune response to an antigen (for example, protein from cow milk), or an autoimmune process. As the intestines are always exposed to things that can cause immune reactions, more recent thinking is that there is a failure of the body to turn off normal immune responses.

Medically Reviewed by a Doctor on 8/18/2016

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Patient Comments & Reviews

The eMedicineHealth doctors ask about Inflammatory Bowel Disease (IBD):

Inflammatory Bowel Disease (IBD) - Diet

Please share what foods you have found to help soothe IBD flares, and what foods trigger or aggravate your disease.

Inflammatory Bowel Disease - Symptoms

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Inflammatory Bowel Disease - Describe Your Experience

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Ulcerative Colitis Symptoms

Ulcerative colitis is an inflammatory bowel disease or IBD. Common symptoms of ulcerative colitis include:

  • Frequent diarrhea with or without blood
  • Urgency to move bowels
  • Loss of bowel control
  • Lower abdominal cramps or discomfort
  • Fever
  • Lethargy
  • loss of appetite
  • Weight


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