Several things: There are two broad categories - your thyroid producing too much or not enough thyroid hormone. Here are the most common: - iodine deficiency - grave's disease (autoimmune - causes thyroid to produce too much thyroid hormone) - hashimoto's - typically too little - multinodular goiter - solitary thyroid nodules - thyroid cancer, heaven forbid. - pregnancy - inflammation.
Answered 9/1/2013
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