It is difficult to determine how quickly or slowly thyroid cancer metastasizes. The speed of metastasis of thyroid cancer is related to its pathologic type and malignancy degree, which varies from person to person. 1. Papillary thyroid cancer is mostly seen in young people, often female, with slow growth, low malignancy, late metastasis, and metastasis in lymph nodes in the neck. 2. Follicular thyroid carcinoma is mostly seen in middle-aged people, with rapid development, moderate malignancy and faster metastasis than papillary carcinoma, and the main metastatic pathway is to reach the lungs and bones through blood. 3. Medullary carcinoma of thyroid is rare, the cells secrete a lot of calcitonin, the malignant degree is moderate, lymphatic metastasis occurs earlier, and it can be carried to the lungs through blood. 4. Undifferentiated carcinoma of thyroid is common in the elderly, with rapid development and highly malignant, and local lymph node metastasis can occur in the early stage of development, or invade the recurrent laryngeal nerve, trachea or esophagus, and then transfer to the lungs and bones by collecting and washing fluid. If thyroid cancer is diagnosed, it is recommended to carry out standardized treatment as early as possible to reduce the adverse effects of the disease. Regular review is also needed after treatment.