Whether chemotherapy is needed after surgery for small breast cancer lumps cannot be generalized and needs to be analyzed and evaluated by a combination of factors. Breast cancer is a common malignant tumor disease, which can be detected in early stage and can be diagnosed and treated in time. Usually, radical surgical resection, breast-conserving surgery combined with postoperative radiotherapy can be effective treatment, and the prognosis is better. Whether radiotherapy is needed after surgical resection of small tumors in early stage breast cancer patients needs to be analyzed and evaluated by doctors with a combination of various examination results. Patients who have no lymph node metastasis, positive hormone receptor test, no other high-risk factors and low risk according to the results of multi-gene test after surgery usually have a better prognosis and may not need chemotherapy. Breast cancer patients should listen to the advice of professional doctors after surgery, improve relevant examinations to clarify the diagnosis, and take scientific and reasonable methods of treatment under the guidance of doctors.