Diarrhea after chemotherapy should be first stool analysis, as follows: 1, if it is infectious diarrhea, anti-infective treatment; 2, if it is non-infectious diarrhea, it is the mucosal reaction caused by the side effects of chemotherapeutic drugs, antidiarrheal symptomatic treatment. Mild diarrhea can be applied to montelukast, emtricitabine, omeprazole and other drugs, if there is a severe diarrhea, can be performed montelukast enema, emtricitabine oral, atropine intramuscular injection, growth inhibitors pumped, if necessary, need to be briefly applied to the treatment of hormone therapy, infusion of electrolyte supplementation therapy, and so on. In short, diarrhea after chemotherapy to analyze the causes of diarrhea, according to the cause of the corresponding treatment measures.