Small bowel cancer can be diagnosed through histopathological examination, capsule endoscopy and imaging examination. 1. Histopathological examination: patients can go to the hospital and take slices of diseased tissues under the guidance of doctors, and then observe them under the microscope to confirm the diagnosis. 2. Capsule endoscopy: patients can go to the hospital for capsule endoscopy examination, if the patient has external pressure change of the intestinal wall or submucosal elevated lesions accompanied by erosion, the patient may suffer from small intestinal cancer. 3. Imaging examination: patients can go to the hospital for imaging examination. Patients with small bowel cancer usually have symptoms such as filling defect of mass formation and intestinal obstruction on abdominal plain film, so as to determine whether they have small bowel cancer. It is suggested that patients should go to regular hospitals for examination in time when they feel unwell, and confirm the diagnosis and treatment under the guidance of doctors.