4 doctors weighed in:

What are the causes of an overactive thyroid?

4 doctors weighed in
Dr. Liuska Pesce
Pediatrics - Endocrinology
3 doctors agree

In brief: 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).

In brief: 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).
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