The side effects of chemotherapy for breast cancer are relatively large. All chemotherapy drugs for breast cancer have different degrees of toxic side effects, and they kill cancer cells as well as normal tissues, especially blood and lymphatic cells that are growing and developing in the human body. The side effects of chemotherapy for breast cancer are as follows: 1. Gastrointestinal reactions: such as nausea, vomiting, nausea, abdominal distension, diarrhea or constipation, etc. 2. Local reactions: such as phlebitis caused by chemotherapy drugs, local skin ulceration and necrosis caused by drug exudation, etc. 3, bone marrow suppression reaction: manifested as low white blood cells, platelet decline, and even anemia. 4, immunosuppression: chemotherapy drugs can suppress immune function, so that the body’s immune function is low, resistance to decline and complications such as infection. 5, visceral damage: such as toxicity of the heart, liver and kidney function damage, cardiac dysfunction, lung fibrosis, etc. 6, after chemotherapy can cause some inflammation of the oral mucosa, some appear oral ulcers, mucosal ulcers. There is also hair loss. 7, hair loss: this hair loss is not permanent hair loss, after the end of chemotherapy most patients can also be hair regeneration. 8, after chemotherapy peripheral neuritis: the patient feels woody, numbness in the hands and feet, some even feel more sluggish, need to beware of being burned, because this period with hands to grab some hot things, she feels bad (sluggish), will cause burns. 9.Other: such as fever, fatigue, flu-like symptoms, systemic allergic reaction, hair loss, etc. 10, induce the occurrence of second tumor: theoretically chemotherapy drugs have induced the occurrence of second tumor in the body.