Goiter is a condition in which the thyroid gland becomes enlarged. The thyroid may enlarge naturally at certain times, such as during puberty and pregnancy.
Abnormal enlargement may be due to a thyroid disorder, such as hyperthyroidism (overactivity of the thyroid gland), hypothyroidism (underactivity of the thyroid gland), or a thyroid tumor; as a side effect of certain medications; or from lack of iodine (needed for proper thyroid function) in the diet.
Most goiters do not cause symptoms, but a large one may make swallowing or breathing difficult.
Treatment may involve medication, radioactive iodine to shrink the thyroid, iodine supplements, or sometimes surgery

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