Crohn’s disease, also known as limited enteritis, segmental enteritis, or granulomatous small bowel colitis, is a chronic inflammatory granulomatous disease of the gastrointestinal tract of unknown etiology. It is currently thought that it may be related to three factors: infection, genetics, and immunity. Mental stimulation, dietary factors and unhygienic habits can induce exacerbation of the disease. The lesions are mostly found in the late ileum and adjacent colon, often in a segmental distribution. The age of onset is usually 15-30 years, but the first attack can occur in any age group, and the rate of disease is similar in men and women. The clinical manifestations of Crohn’s disease are related to the location, extent, severity, duration of the disease and the presence of complications, and the symptoms are diverse: 1. 2, a few acute onset, there may be high fever, toxemia symptoms and acute abdominal manifestations, the whole course of the disease is short, abdominal symptoms are serious, and there are more serious complications. Occasionally, extra-intestinal manifestations such as perianal abscess, fistula formation or arthralgia may be the first symptom, but abdominal symptoms are not obvious. The disease has a lifelong tendency to recur, and the prognosis is poor for patients with severe disease who do not recover.