The small intestine consists of the duodenum, ileum and jejunum, with a total length of 4-6 m. It is located in the middle of the abdomen, and pain in the small intestine often occurs to the right of the subxiphoid process, above the navel and below the navel. When pain occurs in different parts of the body, it often indicates different diseases, so it is necessary to go to the hospital to find a professional doctor for physical examination, and then improve the relevant tests to clarify the specific disease and carry out symptomatic treatment. Common pain sites 1, right under the saber: the duodenal area, often suggests the occurrence of duodenal ulcer and other diseases, sometimes also radiated to the right side of the back, you can follow medical advice to use omeprazole, ranitidine and other drugs; 2, above the navel: pain appears above the navel or left side of the position usually suggests jejunum disease, according to the type of lesion, give treatment. If it is jejunal ulcer, growth inhibitors, acid suppressants and glutamine and other drugs can be applied. If it is a jejunal tumor, surgical treatment is required; 3. Below the navel: pain below or right below the navel usually indicates inflammation at the end of the ileum, such as intestinal tuberculosis, Crohn’s disease, etc.. The intestinal tuberculosis is treated with isoniazid, streptomycin and other drugs as prescribed by the doctor, and Crohn’s disease is treated with 5-aminosalicylic acid and glucocorticoids. A detailed and complete abdominal examination should be done in case of abdominal pain to actively investigate the disease and provide symptomatic treatment for the disease that has occurred.