Clinical manifestations of thyroid cancer metastasis to lymph include localized lymph node swelling, pain and discomfort, hoarseness and so on. Thyroid cancer is easy to metastasize to the lymph nodes in the neck, and the common symptom is enlarged lymph nodes in the lower neck, which is mainly manifested by the fact that enlarged lymph nodes can be felt in the lower neck. When the lymph nodes are large, they may compress the recurrent laryngeal nerve, resulting in hoarseness and choking on drinking water. When the cervical plexus nerve is violated, symptoms such as ear pain may occur. Metastatic lymph nodes are usually painless, but once muscle invasion occurs, there will be pain and limited neck movement. Thyroid cancer is prone to lymph node metastasis, which is usually a sign of a more serious condition and requires aggressive and formal surgical treatment. After surgery, patients need to take thyroxine for TSH suppression treatment, and some patients also need to take iodine 131 treatment. If the patient has any discomfort, he should go to the hospital in time to avoid delaying his condition.