Thyroid cancer, according to the type of pathology, can be divided into roughly four categories: the first is papillary thyroid cancer; the second is follicular thyroid cancer; the third is undifferentiated thyroid cancer; and the fourth is medullary thyroid cancer. Except for medullary thyroid carcinoma, the other three types of carcinomas originate from follicular epithelial cells. Among them, the most common one in clinical practice is papillary thyroid carcinoma. Papillary thyroid cancer accounts for 70% of all thyroid cancers in adults. In contrast, all thyroid cancers that occur in children are basically papillary thyroid carcinomas. Vegetative thyroid carcinoma is well differentiated, slow growing and less malignant. However, papillary thyroid cancer can develop metastasis in the lymph nodes of the neck at an early stage. The healing process of papillary thyroid cancer is relatively good. Follicular thyroid cancer accounts for about 15% of thyroid cancer and lymph node metastasis in the neck accounts for about 10%, so the healing is not as good as that of papillary thyroid cancer. The most malignant cancer of the thyroid gland is undifferentiated carcinoma. The average survival period is about three months to six months, and the one-year survival rate is only 5% to 15%. This type of cancer is the most malignant type of thyroid cancer.