Ultrasound usually has the potential to reveal the presence of tumor metastasis in the lymph nodes. Based on the structure, density and aspect ratio of the lymph nodes, ultrasound can initially determine the nature of the lymph nodes and whether there are metastases. Lymph node metastasis is usually characterized by abnormal morphology and cortical thickening of the lymph nodes, larger than normal lymph nodes, and unclear borders, suggesting that lymph node metastasis may be present. To determine whether there is tumor metastasis in the lymph nodes, it is best to perform a whole-body PET-CT scan. Lymph node metastasis may cause weight loss and fever. Lymph nodes that have metastasized to the surface of the body can be palpated as enlarged, hard, non-tender, and with poor mobility. It is recommended that patients go to the hospital for timely examination and always observe their physical condition.