what is crohns diseawe
Crohn's disease (sometimes called Crohn disease) is a chronic inflammatory disease of the intestines. It primarily causes ulcerations (breaks in the lining) of the small and large intestines, but can affect the digestive system anywhere from the mouth to the anus.rohn's disease facts. 1  Crohn's disease is a chronic inflammatory disease of the intestines. 2  The cause of Crohn's disease is unknown. 3  Crohn's disease can cause ulcers in the small intestine, colon, or both. 4  Abdominal pain, diarrhea, vomiting, fever, and weight loss are symptoms of Crohn's disease.