Some people think that breast cancer is a happy cancer because with the development of medicine, breast cancer can be detected and treated as early as possible, and the prognosis is better than other cancers, so it is more “happy” than other hard-to-treat cancers. Breast cancer is one of the more common malignant tumors in women. Usually, the occurrence of breast cancer is related to endocrine hormone disorder, family history of breast cancer, bad living habits, radiation environment, etc. Through timely medical screening, early detection and change of controllable cancer-causing factors, early detection of malignant tumors, surgery and systemic adjuvant treatment can make breast cancer have better prognosis than other hard-to-treat cancers. With the advancement of medicine, the 5-year survival rate of breast cancer has improved. Breast cancer patients can effectively control the deterioration of the disease by regular review, avoiding stimulation by smoking and alcohol, staying away from dangerous environment, and maintaining good lifestyle habits. Early detection, early treatment, post-operative comprehensive adjuvant therapy, and timely check-ups and follow-ups at hospitals, as well as timely change of treatment plan in case of axillary lymph node metastasis and, if necessary, axillary lymph node dissection and additional chemotherapy drugs, can effectively control the development of breast cancer and reduce the chance of recurrence.