Lymph node metastasis occurs at variable times, often in the middle to late stages of cancer, mostly in stages III to IV. Cancer is the collective name for malignant tumors, and the main treatment modality is still a comprehensive treatment based on radical surgery. Lymph node metastasis in cancer patients includes local lymph node metastasis and distant lymph node metastasis. If a patient has only local lymph node metastasis and the number is relatively small, the pathological stage is often stage II or III. If distant lymph node metastasis is present, the pathological stage is usually stage IV, which means advanced cancer. Once the cancer has lymph node metastasis, it indicates that the patient’s disease has progressed and the time of appearance of the disease will not be too early, but there is still hope for surgical cure, and the main treatment is by expanding the resection of the primary tumor lesion, plus regional lymph node dissection. However, if distant lymph node metastasis has occurred, surgery is usually not curable, but can only be treated with systemic chemotherapy, targeted therapy, local radiotherapy, etc.