The following medical history and physical findings are risk factors for thyroid cancer: ① History of head and neck radiation during childhood. ②History of systemic radiation therapy. ③Previous history or family history of thyroid cancer or MEN2, familial polyposis, certain thyroid cancer syndromes. ④Male. ⑤ Rapid nodule growth. (6) With persistent hoarseness and dysphonia, and vocal cord lesions can be excluded. (7) Difficulty in swallowing or breathing. ⑧The nodules are irregular in shape and fixed with the surrounding tissues. (9) Pathological enlargement of lymph nodes in the neck.