For determining whether thyroid cancer is combined with lung metastasis, the lung nodules need to be judged based on a thin-layer CT scan of the chest before surgery. If there is a history of thyroid cancer and the thin-layer CT of the lung suggests that the nodules tend to be metastatic, thyroid cancer with pulmonary metastasis needs to be highly suspected. In this case, total thyroid cancer resection is usually recommended, and further iodine-131 examination is performed after surgery to determine whether the nodule is a metastasis of thyroid cancer by the uptake of iodine by the lung nodules. If it is clear that thyroid cancer has metastasis in the lung, Iodine-131 treatment can also achieve better results. Thyroid cancer combined with lung metastasis usually indicates advanced tumor and has a better prognosis than other advanced tumors. Because most thyroid cancers belong to differentiated thyroid cancer, differentiated thyroid cancer itself is lazy cancer and develops very slowly, even if distant metastasis occurs, the development of distant metastases is also very slow, mainly through iodine-131 and other related treatments. If the disease has progressed, it can be treated with a combination of relevant targeted drugs and other treatments.