The course of thyroid cancer is related to its stage, i.e., the size of the tumor, the pathological classification, whether it has metastasized at the stage it is at, and the general condition of the individual, and more details are needed to predict whether or not there will be any significant changes in 2 months’ time. Thyroid cancer is classified into stages I, II, III and IV, based on the size and type of tumor and whether metastasis has occurred at the time of diagnosis. The patient’s tumor stage can be determined through various test results and surgery. Stage I and II tumors are low-risk and have a better prognosis, with less likely changes in 2 months, while Stage III and IV tumors are considered high-risk, with possible changes in 2 months and a higher likelihood of recurrence or residual cancer after treatment. 98% of primary thyroid cancers are well-differentiated and have an excellent long-term prognosis with treatment, with a twenty-year survival rate of over 90%. Primary thyroid cancer can be categorized into papillary, follicular, medullary, and undifferentiated cancers, among which undifferentiated cancers only account for 1 to 2%, which is one of the most rapidly deteriorating and fatal cancers, and often cannot be eradicated by the time it is detected. Metastatic cancer is cancer that has metastasized to the thyroid gland, mostly from kidney cancer, breast cancer, or lung cancer, which usually has a longer treatment course and a poorer prognosis.