The time of occurrence of mid-stage thyroid cancer is not fixed, it may be a few months or one or two years, etc. Thyroid cancer includes many types, such as papillary cancer, undifferentiated cancer, etc. Different types of thyroid cancer have different speeds of disease progression. Different types of thyroid cancer have different speeds of disease progression. If it is undifferentiated cancer, this type of thyroid cancer is highly malignant and has rapid disease progression, and may reach the middle stage in a few months, while if it is papillary cancer, the malignancy is relatively low and the disease progression is relatively slow, and it may take one or two years to reach the middle stage. After the occurrence of thyroid cancer, it is necessary to judge the size of the tumor, the presence of lymph node metastasis, the absence of distant metastasis, and be able to stage the nail cancer before deciding how to treat it.