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TSH is not a thyroid hormone - it is a pituitary hormone called Thyroid Stimulating Hormone. It's job is to tell the thyroid how much thyroid hormone to produce. This is called a negative feedback system.

  • The thyroid produces hormone.
  • The brain reads that there is insufficient hormone in the body
  • The pituitary gland in the brain produces more TSH that turns the thyroid on
  • More TSH means the thyroid produces even more thyroid hormone.

When there is too much thyroid hormone in the body, the pituitary turns off TSH as the body doesn't need any MORE thyroid hormone.

If the brain, pituitary and thyroid are working properly, thyroid hormones T4 and T3 will be high (hypERthyroidism) when TSH is low, and thyroid hormones T4 and T3 will be low (hypOthyroidism) when TSH is high.

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12y ago

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