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why is there a higher level of thyroid hormone secreted in cases of pituitary tumors? this...

why is there a higher level of thyroid hormone secreted in cases of pituitary tumors?


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Answer #1

Thyroid hormones are thyroxine(T3) and Triiodothyronine(T4).

Synthesis of thyroid hormones is mainly stimulated by Thyroid stimulating hormones(TSH) produced from anterior lobe of pituitary gland.

**When there is a tumor in pituitary gland(TSH secreting pituitary adenoma), it will overproduce thyroid stimulating hormone.

Abnormally increased levels of TSH will cause increased synthesis of thyroid hormones.

Excess of thyroid hormones synthesis is called hyperthyroidism.

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