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Hypothyroidism (pronounced /?ha?p???a?r??d?z?m/) is a condition leading to the deficiency in the production of thyroid hormone.

Iodine deficiency is the most common cause of hypothyroidism worldwide but it can be caused by any number of other causes such as several conditions of the the thyroid gland, or less commonly, the pituitary gland or hypothalamus.[1] It can result from a lack of a thyroid gland. It can also be due to iodine-131 used to treat thyroid cancer, its surgical removal.

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