Swollen lymph nodes after thyroid cancer surgery may be caused by wound infection, metastatic cancer in the lymph nodes and other reasons. Swollen lymph nodes after thyroid cancer surgery may be caused by wound infection. Because of the inconvenient diet, low immunity or untimely change of medicine by doctor, it causes cervical lymphitis, which will lead to the symptom of swollen lymph nodes, and it can be treated by taking oral medicines such as cefuroxime and roxithromycin under the doctor’s instruction. Swollen lymph nodes after thyroid cancer surgery may also be caused by metastatic cancer in lymph nodes, which will have symptoms such as swollen lymph nodes, coughing, chest tightness, difficulty in breathing, etc., which can be removed by surgical treatment. Therefore, patients with swollen lymph nodes after thyroid cancer surgery should go to the hospital as soon as possible to find out the cause of the disease and carry out standardized treatment under the guidance of doctors.