Whether you eat iodized salt or non-iodized salt depends mainly on whether the area you live in is iodine deficient or not. If the area is iodine deficient, salt iodization should be implemented. If the area is not iodine deficient but iodine rich, such as coastal areas, where seafood such as seaweed and nori are consumed more often, you can consider choosing non-iodized salt. Iodine deficiency can lead to thyroid disorders, such as enlarged thyroid gland, nodular goiter, and hypothyroidism. Hypothyroidism can affect the intellectual and physical development of a person. If a baby is iodine deficient in the mother’s womb, it can lead to the birth of a child with cretinism, who is prone to dullness, deafness, dwarfism and dumbness after birth. The introduction of universal salt iodization in China is also intended to prevent iodine-deficiency related thyroid diseases caused by this deficiency. Excessive iodine can cause hyperiodothyroidism, hyperthyroidism, inflammation of the thyroid gland, iodine allergy and iodine toxicity, and can also transform a latent thyroid autoimmune disease into a dominant disease. Such patients are advised to consume non-iodized salt to avoid excess iodine causing excessive hormone synthesis and aggravating symptoms. Excessive iodine supplementation is generally not recommended, and it is sufficient to maintain a reasonable diet. If you have a thyroid disease, you can follow your doctor’s instructions to choose the right salt for your diet.