Thyroid cancer is a malignant tumor arising from thyroid epithelial cells, the vast majority of which originate from follicular epithelial cells, and can be classified according to pathological type as papillary, follicular, medullary, and undifferentiated thyroid cancer. Papillary and follicular carcinomas, also known as differentiated carcinomas, usually have a better prognosis. Medullary carcinoma is relatively fast growing, moderately malignant, and prone to hematogenous metastasis; undifferentiated carcinoma has a poor prognosis, with an average survival time of 3-6 months. The prognosis of carcinoma depends on the extent of lesions, such as whether the tumor is confined to one side of the glandular lobe, whether it breaks through the perineum, whether there is invasion of large blood vessels, whether there is lymph node metastasis and distant metastasis, and after there is distant metastasis outside the thyroid gland, it means a high recurrence rate and mortality. Papillary thyroid cancer, also known as “inert cancer”, is the most common type of cancer in clinical practice. It develops extremely slowly, especially micro papillary cancer, and does not even progress for decades. The first of these is the “happy cancer” because of its slow-growing, easily curable biology.