Crohn's disease is an idiopathic inflammatory and infectious disease of the intestines that can occur in any part of the gastrointestinal tract, but it is most commonly found at the end of the ileum or in the right colon. The main clinical symptoms include abdominal pain, diarrhea, accompanied by fever, or manifestations of nutritional dysfunction. The condition is often protracted and recurrent, and it is not easy to completely cure. The latency period varies depending on the patient's situation.