Chemotherapy is very commonly used and may be used in the course of treatment of various tumors at different times. The most common side effects of chemotherapy may be gastrointestinal reactions, such as nausea, vomiting, acid reflux, etc. The treatment is mainly the application of antiemetic drugs, such as ondansetron, metoclopramide, and drugs that inhibit gastric acid, such as proton pump inhibitors and the like, and cimetidine, all of which can improve gastrointestinal reactions. In addition, chemotherapy may cause myelosuppressive reactions, the most common of which is the decrease of white blood cells, platelet reduction, and worsening of anemia, which can be treated with oral whitening drugs such as diethylstilbestrol tablets and licoquinone tablets. If the decrease is more, it is necessary to apply subcutaneous injection to raise white blood cells and platelets, and at the same time strengthen nutrition to help raise white blood cells and platelets. There are also other allergic reactions and skin reactions that can be prevented with anti-allergy medications.