World Iodine Deficiency Day, also known as Global Iodine Deficiency Disorders Prevention Day, is observed worldwide every October 21. The day aims to highlight the dangers of iodine deficiency and promote the consumption of iodized salt to prevent related disorders. Iodine is crucial for producing thyroid hormones essential for growth, development, and metabolism. Severe iodine deficiency can lead to serious health issues, including goiter and intellectual disabilities, particularly affecting children. Events and activities are organized by healthcare organizations globally, especially in regions where iodine deficiency is prevalent, such as Africa, Southeast Asia, and the Western Pacific. The recommended daily intake of iodine varies by age and condition, with pregnant and lactating women needing higher amounts.