Nail cancer and thyroid cancer, postoperative lymph node enlargement can be caused by postoperative infection, reactive hyperplasia, tumor recurrence and metastasis, etc. The cause of the disease should be found out, and medication and surgical treatment should be carried out according to the situation. 1. Postoperative infection: when there are complications such as infection after thyroid cancer surgery, it can lead to enlarged lymph nodes, and antibiotics such as cephalosporin should be used according to the results of bacterial culture and drug sensitivity test. 2. Reactive hyperplasia: due to surgical stimulation, it can lead to reactive hyperplasia of peripheral lymph nodes, generally no special treatment is needed, regular observation is enough. 3. Tumor recurrence and metastasis: lymph node enlargement may be caused by recurrence and metastasis when thyroid cancer is rechecked after surgery; lymph node biopsy should be carried out to make a clear diagnosis, and then surgery or cisplatin and other chemotherapeutic drugs should be carried out to treat the disease. Lymph node enlargement after thyroid cancer surgery should be promptly consulted and treated accordingly to avoid delaying the condition.