For most colon cancer patients, systemic chemotherapy is required. There are many different adverse effects of chemotherapy drugs, the common ones include: 1) myelosuppression: during or after chemotherapy, there will be a decrease in hemoglobin, red blood cells, white blood cells and platelets, which should be actively treated symptomatically; 2) gastrointestinal reactions: most chemotherapy drugs can cause gastrointestinal reactions, including abdominal distension, abdominal pain, diarrhea, loss of appetite, vomiting and nausea. If GI reactions occur during chemotherapy, antiemetic treatment should be actively carried out to enable patients to tolerate GI reactions during chemotherapy; 3.