Even when a drug blocks the main signal (TSH) that tells the thyroid to make more hormone, the thyroid still keeps producing high levels of the enzyme that activates thyroid hormone during cold...

Thyroid Hormone Levels and Expression of Genes Involved in Regulation of Thyroid System Activity in Male Rats Exposed to Prolonged Low Temperatures, and the Effect of a Thyroid-Stimulating Hormone Receptor Antagonist on These Parameters