Causes: Autoimmune. Either the immune system makes a protein that stimulates the thyroid to be "on" all the time (graves disease) or the immune system is destroying the thyroid cells, increasing thyroid hormone release. Unusual causes are a cluster of cells working a higher speed (hyperfunctioning nodule) or activation in the protein that tells the thyroid to work more (tsh receptor).
Answered 6/20/2019
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