Iodine is a chemical element the body needs but cannot make it, so Iodine must come from diet. The thyroid gland needs iodine to make hormones. If the thyroid doesn’t have enough iodine to do its job, systems in the body cause the thyroid to work harder. This can cause an enlarged thyroid gland (goiter), which causes a swollen neck. Other consequences of not having enough iodine (iodine deficiency) are also serious.

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