Crohn’s disease is an autoimmune disease. A study from Crohn’s and Colitis Foundation of America revealed that as many as 700,000 American people are diagnosed with Crohn’s disease. Crohn's disease is a chronic inflammatory disease of the intestine which affects gastrointestinal tract (GI tract) from the mouth to the anus. It primarily affects the end of the small intestine the ileum where it joins the large intestine (or colon). The Crohn's disease not only affects the last segment of the small intestine, the inflammation can lead to destructive effect in other part of the body like joints, eyes, mouth and skin. It can also develop stones in kidney and gall.