Hypothyroidism is classified based on the origin of the hormone deficiency, whether it stems from the thyroid gland itself (primary), the pituitary gland (secondary), or the hypothalamus (tertiary).
Hypothyroidism, or underactive thyroid, develops when the thyroid gland does not produce enough of the hormones thyroxine (T4) or triiodothyronine (T3). Around 5% of people ages 12 and older in the ...
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