Many thyroid cancer patients, especially young women with thyroid cancer, ask: How can I get thyroid cancer at such a young age? Is thyroid cancer a genetic disease? Two of my surgeries tomorrow appealed to me because the patients were sisters who were considered to have thyroid cancer on ultrasound, and they asked me the question of whether thyroid cancer is a genetic disease. It is true that a small percentage of papillary thyroid cancers are genetically altered genetic diseases, but it is currently believed that such patients do not account for more than 1% of all thyroid cancers. However, it is very common to have multiple thyroid cancer patients in one family. What is the best way to understand this problem and to inform patients of such concerns? The exact cause of familial thyroid cancer, or familial aggregation of thyroid cancer, needs to be further studied and will not be developed here. However, I believe that the presence of two or more papillary thyroid cancer patients in each generation of the family is called familial thyroid cancer. Therefore, if there are two or more patients with papillary thyroid cancer in each generation, it is recommended that all family members in each generation should undergo routine thyroid examination for early detection of thyroid cancer.