Why does Graves' disease, characterized by excessive thyroid hormone production, NOT always result in dangerously high systemic iodine uptake?

💡 Explanation

In Graves' disease, although iodine uptake is increased, the elevated T3 and T4 levels trigger negative feedback inhibition on TSH release from the pituitary; because TSH stimulates iodine uptake, the reduced TSH limits further iodine uptake. Therefore, systemic iodine uptake is moderated, rather than reaching dangerously high levels, even with thyroid-stimulating antibodies continuously present.

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