Breast cancer less than 2cm is not necessarily early stage, but also depends on whether there is lymph node metastasis and distant metastasis, and breast cancer without lymph node metastasis and distant metastasis and <2cm belongs to early stage. Early stage of breast cancer means that the lesion is relatively small and there is no lymph node metastasis and distant spread. The prognosis of early-stage breast cancer patients is very good after surgical treatment, supplemented by postoperative radiotherapy, chemotherapy and other comprehensive means of treatment, and the 5-year survival rate reaches more than 90%. Although the lesion of breast cancer less than 2cm is more limited, once lymph node metastasis or distant metastasis is found, it is not considered as early stage of breast cancer. If breast cancer <2cm is detected, the patient should go to the hospital in time, clarify the stage of breast cancer through further examination, and choose the appropriate treatment to prevent the disease from further progress.