Neck lymph node swelling for several years has not disappeared, do not rule out the lymph node metastasis of thyroid cancer, this time need to check the thyroid gland; but it may also be acute lymphadenitis, lymph node tuberculosis and so on. Specific problems need to be analyzed. 1. Lymph node metastasis of thyroid cancer: Usually the early symptoms of thyroid cancer are painless lumps or nodules in the thyroid gland. Lymphatic metastasis will have enlarged lymph nodes in the neck. At this time, it is necessary to check the ultrasound of thyroid gland and combine with other tests such as thyroid function tests. 2. Acute lymphadenitis: it can be caused by EBV, cytomegalovirus, pathogenic bacteria, etc. It often has pressure pain, smooth surface, good mobility, and no adhesion. There are usually some systemic manifestations, such as fever. 3. Lymph node tuberculosis: it can also be manifested as enlarged lymph nodes in the neck. The lymph nodes are often adherent to the surrounding tissues and can break down, eventually forming fistulas, accompanied by other symptoms of tuberculosis, such as low-grade fever in the afternoon and increased night sweating. The enlarged lymph nodes in the neck have not disappeared for several years, and there may be other reasons, so it is recommended to improve the examination to find the cause, scientific treatment.