There are no good, specific, special preventive measures for thyroid cancer, mainly to prevent radiation exposure, which may be affected by eating seafood contaminated with nuclides, and other thyroid diseases, which are still under research, and which are not good, well-proven effective methods. Avoiding radiation treatment or eating contaminated seafood, especially from the Fukushima nuclear power plant, is one of the more definite ways. In addition, if there are parents or siblings with this disease in the family, it is recommended to go for regular ultrasound; if there are no nodules in the family, thyroid examination should be done in six months or a year or so; if there is this disease in the family, examination should be done in three months or six months; if thyroid disease has been diagnosed, examination should be done in three months or six months, depending on the situation; if it is determined that there is a history of thyroid cancer in the family, examination should be done in three months or six months. If there is a history of thyroid cancer in the family, it is recommended to do more frequent or better examinations or even blood sampling to avoid the development of the disease.