Whether the swollen lymph nodes in subclavian area are metastatic or not two years after breast cancer surgery should be viewed comprehensively by synthesizing pathological manifestation, imaging manifestation, clinical symptoms and so on. 1. Pathological manifestation: two years after breast cancer surgery is the first high incidence period of breast recurrence, so the swelling of subclavian lymph nodes should be highly alert to the occurrence of metastasis, especially for patients who have metastasis when they suffer from breast cancer, at this time, they should take tissues from subclavian lymph nodes and axillary lymph nodes by puncture to make the nature of the nodes clear by pathology. 2. Imaging manifestation: breast cancer most often metastasizes to lung, bone and brain, so when subclavian lymph node is found to be swollen two years after breast cancer surgery, the CT or MRI of these organs should be examined. If lung, bone and brain are found to have tumor, further enhancement of MRI or CT should be considered to make clear whether there are malignant tumors or not, and this method can also determine whether there is metastasis or not. 3. Clinical manifestations: some patients with breast cancer recurrence will show tumor consumption status such as wasting, fatigue, loss of appetite, and the corresponding symptoms of metastatic organs such as bone and joint pain, headache, rapid growth of lymph nodes, etc. The lymph node enlargement caused by acute inflammation is mostly manifested as local lymph node pain, and the clinical symptoms play a role of hints to determine whether there is metastasis of breast cancer or not. Due to individual differences and different conditions, if subclavian lymph nodes are found to be enlarged two years after breast cancer surgery, it is necessary to consult a doctor in time to find out whether there is metastasis or not, so as to avoid delaying the condition.