Mostly thyroid: Thyroid disease: graves or toxic nodular goiter; thyroiditis: subacute, post partum, "hashitoxicosis; very rarely thyroid cancer, or pitutary tumor making tsh. Taking too much thyroid hormone (beware of "herbal" supplements. Trophoblastic disease during pregnancy. The diagnosis is usually graves, toxic goiter, or thyroiditis.
Answered 2/24/2013
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