Not common: The most common cause of hyperthyroidism is graves disease, an autoimmune disorder that stimulates the thyroid to be overactive. Another autoimmune thyroid disease is hashimoto's thyroiditis, in which the immune system is attacking and destroying thyroid function. Sometimes you can start with one, and it can evolve into the other. Also, subacute thyroiditis causes initial high thyroid that goes low.
Answered 4/28/2016
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