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How are goiters formed?

How are goiters formed?

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Answer #1

Hyperthyroid goiter—If the amount of stimulating hormone is excessive, the thyroid will both enlarge and secrete too much thyroxin. The result—hyperthy roidism with a goiter. Graves’ disease is the most common form of this disorder. Euthyroid goiter—The thyroid is the only organ in the body to use iodine. If dietary iodine is slightly inadequate, too little thyroxin will be secreted, and the pituitary will sense the deficiency and produce more TSH. The thyroid gland will enlarge enough to make sufficient thyroxin. Hypothyroid goiter—If dietary iodine is severely reduced, even an enlarged gland will not be able to make enough thyroxin. The gland will keep growing under the influence of TSH, but it may never be able to make enough thyroxin.

http://www.answers.com/goiter?cat=health&gwp=11&method=3&ver=2.3.0.624

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