This picture shows the anatomic distribution of Crohn’s Disease.
Normally, the immune system helps protect the body, but with Crohn’s  disease the immune system can’t tell the difference between normal body  tissue and foreign substances. The result is an overactive immune  response that leads to chronic inflammation. This is called an  autoimmune disorder.
People with Crohn’s disease have ongoing (chronic) inflammation of  the gastrointestinal tract. Crohn’s disease may occur in any area of the  digestive tract. There can be healthy patches of tissue between  diseased areas. The inflammation causes the intestinal wall to become  thick.
There are different types of Crohn’s disease, depending on  the part of the gastrointestinal tract that is affected. Crohn’s disease  may involve the small intestine, the large intestine, the rectum, or  the mouth.

This picture shows the anatomic distribution of Crohn’s Disease.

Normally, the immune system helps protect the body, but with Crohn’s disease the immune system can’t tell the difference between normal body tissue and foreign substances. The result is an overactive immune response that leads to chronic inflammation. This is called an autoimmune disorder.

People with Crohn’s disease have ongoing (chronic) inflammation of the gastrointestinal tract. Crohn’s disease may occur in any area of the digestive tract. There can be healthy patches of tissue between diseased areas. The inflammation causes the intestinal wall to become thick.

There are different types of Crohn’s disease, depending on the part of the gastrointestinal tract that is affected. Crohn’s disease may involve the small intestine, the large intestine, the rectum, or the mouth.

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