Excessive iodine intake can also affect the normal physiological function of the thyroid gland and increase the risk of thyroid cancer. People living in coastal cities usually consume more seafood and love to eat pickled seafood, which may not only cause thyroid-related diseases, but also lay a hidden risk of thyroid cancer. Therefore, you should insist on consuming iodized salt without additional iodine supplementation, especially for young women. Mental factors also have a great impact on endocrine organs, so maintaining an optimistic mood can help prevent thyroid cancer, and people over 20 years old, especially white-collar women with high mental stress, family history of thyroid cancer, and residents of coastal areas, should have a medical checkup at least once a year at a regular specialized hospital.