Swollen lymph nodes after thyroid ablation may be due to local inflammation, postoperative infection and cancer metastasis. 1. Local inflammation: lymph node enlargement may be caused by local inflammation around the thyroid gland, at this time, generally do not need special treatment, after the inflammation subsides, the enlarged lymph nodes can recover by themselves. 2. Postoperative infection: after thyroid ablation surgery, infection may occur, which may lead to enlarged lymph nodes, at this time, anti-infection treatment should be carried out, such as the application of cefuroxime and so on. 3. Cancer metastasis: if thyroid ablation surgery is performed because of thyroid cancer, there is a possibility that the metastasis of cancer cells may lead to enlarged lymph nodes after the surgery, which can be treated by re-surgery at this time. If the lymph nodes are enlarged after thyroid ablation, you should seek medical treatment in time.