In patients with small bowel cancer, there will be no obvious change in the stool. This is because anatomically, small bowel cancer mainly refers to malignant tumors of duodenum, ileum and jejunum, which are relatively far away from the anus, and will not cause too obvious changes to the stool. Due to the tumor itself, when the tumor tissues collapse, the bleeding will be discharged along with the stool, which is manifested as stool with blood stains during defecation. Secondly, due to the obstruction of intestinal canal by the small intestine cancer tissues, which leads to intestinal obstruction, the patient may have the manifestations of abdominal pain, abdominal distension, nausea, vomiting and stopping of defecation in anus, and there may also be systemic manifestations, such as emaciation, anemia, and generalized weakness, etc. The patient should be aware of the need to take care of the patient’s health after the cancer occurs. After the occurrence of small intestine cancer, patients need to go to the hospital for examination in time and actively cooperate with doctors for treatment.