High-risk objects
        Anyone with one of the following conditions is a high-risk target for thyroid cancer:
        1. History of head and neck radiation exposure or exposure to radiation dust in childhood;
        2. Due to other diseases, the head and neck have been treated with radiotherapy;
        3. Differentiated thyroid cancer (DTC), medullary thyroid carcinoma or multiple endocrine neoplasia type 2 (MEN2), familial multiple polyposis and certain thyroid cancer syndromes (such as Cowden syndrome, Carney syndrome) History or family history (blood relationship) of symptoms, Werner syndrome, Gardner syndrome, etc.);
        4. Thyroid nodules> 1 cm, and the nodules grow rapidly, growing to more than 1 cm within half a year;
        5. Thyroid nodules> 1 cm, with persistent hoarseness, dysphonia, dysphagia or dyspnea, and vocal cord lesions (inflammation, polyps, etc.) can be ruled out;
        6. Thyroid nodules> 1 cm, with swollen lymph nodes in the neck;
        7. Calcitonin is higher than the normal range;
        8. Mutations in the RET gene.
 
Screening recommendations
        1. For thyroid screening, functional examination and morphological examination should be carried out at the same time;
        2. There are currently no standard tests for early detection or routine screening of thyroid cancer in the general population. Clinical neck physical examination: once every 2~3 years for 20-29 years old, and once a year after 30 years old. Neck ultrasound examination: once a year after 30 years old (including thyroid gland, neck, supraclavicular);
        3. Neck ultrasound (including thyroid, neck, and supraclavicular) examinations for people at high risk of thyroid cancer, once a year.

        4. Before pregnancy and at the end of breastfeeding period, it is recommended to have a neck ultrasound examination respectively.

Prevention advice
        1. Avoid history of exposure to radiation and radioactive dust in the head and neck;
        2. Live a healthy life, eat a reasonable diet, and increase exercise;
        3. Reasonably channel bad emotions.