Chronic gastroenteritis is a chronic inflammation that occurs in the mucous membrane of the gastrointestinal tract. The basic pathological change is the infiltration of a large number of neutrophils or lymphocytes in the mucosa. Examinations mainly include endoscopy and routine stool tests. Gastroscope and colonoscopy can be used to assess the extent of mucosal lesions in the gastrointestinal tract, and routine stool tests can determine the presence of occult blood positivity. If there is blood in the stool, a routine blood test can also be conducted to check for chronic blood loss anemia. Based on the results of these examinations, the severity of the lesions can be understood, and appropriate medications can be actively chosen for symptomatic treatment.