Axillary lymph node metastasis generally refers to tumors in other parts of the patient’s body that have metastasized to the axilla through the lymphatic route. Axillary lymph node metastasis is generally directed to patients with tumors. The axillary lymph nodes are often responsible for collecting lymphatic fluid from the ipsilateral chest wall, breast, skin, and subcutaneous tissues to pool in the central vein, and tumors in the above areas can metastasize to the axilla through the lymphatic circulation. The most common tumors with axillary lymph node metastasis are breast tumors and lymphomas, in addition, certain tumors in the thoracic cavity are also prone to axillary lymph node metastasis. Tumor metastasis to the axillary lymph nodes can lead to axillary lymph node enlargement, which is usually not accompanied by pain, and active anti-infective treatment is usually ineffective. When axillary lymph node metastasis occurs, patients need to go to the hospital actively to search for the primary lesion and carry out active treatment.