Solution

Iodine deficiency is the major cause of goitre worldwide, but this is rarely a cause in more economically developed countries where iodine is routinely added to salt. Cretinism -It is dueto insufficient thyroid hormone. Myxedema can also develop when someone stops taking their thyroid medication. It's more common in the elderly and in women. It is due tothyroidhormonelevels become extremely low in the body. Hypothyroidism is the most commoncauseofan autoimmune disorder known asHashimoto'sthyroiditis.