In breast cancer patients, metastasis to lymph nodes is only one of the manifestations of the disease development, but the main determinant of survival time is the stage of the cancer. Generally, the more advanced the stage of cancer, the shorter the survival time and the worse the prognosis. According to the size of the tumor, the existence of distal metastasis and the different grading of the involved lymphocytes, breast cancer metastatic lymph nodes are mainly classified into stage II-IV. If in stage II of breast cancer, the five-year survival rate is 93%; in stage III, the five-year survival rate is 72%; and in stage IV, the five-year survival rate is 22%. Breast cancer metastasis to lymph is mainly to the axillary lymph nodes, followed by the internal breast lymph nodes, supraclavicular and infraclavicular lymph nodes. If breast cancer cells metastasize to the medial lymphatic vessels, they will reach the sternal lymph nodes or lymph nodes at the clavicle, and then the cancer cells can enter the bloodstream through the lymph and metastasize to other organs of the body, causing cancerous changes in other organs and speeding up the deterioration of the disease. Therefore, if lymphatic metastasis occurs in the early stage, lymph node dissection in the axilla can be done in time, and postoperative adjuvant radiotherapy or chemotherapy can be used. In addition, it is recommended that if breast cancer is detected, patients should undergo anti-cancer treatment in time to actively control the further metastasis and spread of cancer cells in order to prolong the survival time of most patients. In addition, during the treatment period, patients should have a reasonable diet, balanced nutritional intake, adhere to the appropriate amount of exercise and avoid staying up late, which can help to enhance their physical fitness, activate their own immunity and use their own immunity to fight against cancer cells, which can also help to prolong their survival time.