If vomiting occurs after treatment of intestinal cancer patients, the reasons may be as follows: 1. If vomiting occurs during adjuvant chemotherapy after intestinal cancer surgery, it is mostly considered to be the side reaction of chemotherapy drugs, and antiemetic symptomatic treatment can be carried out at this time; 2. If the patient has advanced stage of intestinal cancer and only has vomiting symptoms, no abdominal pain, abdominal distension, no defecation and exhaustion stop, then it is considered to be the side reaction after drug treatment. If the patient has abdominal pain, and there are symptoms of stopping defecation and exhaustion, then consider the possibility of intestinal obstruction of the patient, and suggest to perform abdominal standing plain film examination. If the patient has liquid and gas flat, then the diagnosis of intestinal obstruction is made, and the patient is suggested to actively treat the intestinal obstruction. 3. If the patient has vomiting after intestinal cancer treatment, and if there is fever and diarrhea at the same time, the patient is considered to have possible intestinal infection, and it is suggested to perform routine stool examination and routine blood examination. If it is clear that it is intestinal infection, anti-infection treatment should be given.