Thyroiditis: Sometimes a thyroid is hyperactive because of an acute inflammation (thyroiditis). This can be secondary to an autoimmune (hashimoto's), or infectious inflammation. In this case, the thyroid can then become "under" active, or hypothyroid. It is unlikely for grave's to resolve w/o treatment. http://www.mayoclinic.org/diseases-conditions/hashimotos-disease/basics/definition/con-20030293.
Answered 1/10/2014
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