The side effects of chemotherapy for breast cancer are as follows: i. Hair loss: Most people think of hair loss, because hair loss causes many women to refuse chemotherapy or not want to have chemotherapy. Gastrointestinal reactions: They include nausea, vomiting, tedious eating, and constipation. During breast cancer chemotherapy, it is important to keep the bowels open and eat a light diet. Bone marrow suppression: It is usually seen in the chemotherapy period of breast cancer, mainly manifested as blood cell reduction, which is a decrease of white blood cells, red blood cells and platelets. In this case, it is necessary to take measures to raise white blood cells, promote red blood cell count, and raise platelets to relieve.