Thyroid cancer may metastasize. The lymph nodes around the thyroid tissue are relatively rich, once thyroid cancer occurs, the local cancer cells will often metastasize and spread through the lymphatic tissues, which may result in enlarged lymph nodes in the neck, and metastasis to the liver and lungs may also occur. When metastasis of thyroid cancer occurs, systemic lesions may appear, and regular radiotherapy and chemotherapy should be carried out under the guidance of doctors, and if the metastatic foci are large in size, timely surgical resection of the diseased tissues should also be considered. Thyroid cancer must be detected and treated at an early stage, and the prognosis may be relatively poorer after metastasis has spread. While treating thyroid cancer, it is necessary to actively investigate whether metastasis has occurred in order to promote the recovery of the disease.