Authors' Note:
TSH: thyroid stimulating hormone, also known as thyrotropin, initialism for a peptide hormone produced by the anterior pituitary gland in a feedback loop that regulates production of thyroid hormones by the thyroid gland
Hyperthyroid states in which the level of TSH is reduced include Graves' disease, subacute thyroiditis (inflammation of the gland), autonomous thyroid nodules and excessive thyroid hormone replacement. Hyperthyroidism in which the blood level of TSH is found to be elevated is extremely uncommon, related to very rare functioning tumours of the pituitary gland.
Hyperthyroid states in which the level of TSH is reduced include Graves' disease, subacute thyroiditis (inflammation of the gland), autonomous thyroid nodules and excessive thyroid hormone replacement. Hyperthyroidism in which the blood level of TSH is found to be elevated is extremely uncommon, related to very rare functioning tumours of the pituitary gland.
The operation of the feedback loop in relation to states of thyroid deficiency is discussed HERE.
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