International Online News (Reporter Pan Ying): May 15 this year is my country’s 21st “Iodine Deficiency Disease Prevention and Treatment Day”, with the theme of “Scientific iodine supplementation to protect normal intellectual development”. In our country, salt iodization has been used to prevent iodine deficiency diseases since the 1990s. So what harm will iodine deficiency bring to human health? Are people\’s iodine intake exceeding the standard now? Does it increase the incidence of thyroid cancer as reported online?