The most common toxic side effects of chemotherapy are bone marrow suppression, gastrointestinal reactions, neurotoxicity, etc. Therefore, during chemotherapy, in order to prevent and treat the above chemotherapy reactions, patients should consume more of the following foods: 1, foods with medicinal food and blood tonic effects, such as red dates, Agaricus, black beans, black rice, barley, sea cucumber, etc., to reduce the occurrence of bone marrow suppression reactions; 2, patients should also add more fresh fruits and vegetables Patients should also take more fresh fruits and vegetables to increase the vitamin content in the body to reduce gastrointestinal reactions and neurotoxicity; 3. Patients will have a decreased appetite and poor nutritional intake due to gastrointestinal reactions during chemotherapy, which will easily lead to combined hypoproteinemia. In short, chemotherapy should be supplemented with appropriate food according to the patient’s response to chemotherapy.