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 ...
Hypothyroidism is when the thyroid gland does not produce enough thyroid hormones, whereas hyperthyroidism is when the thyroid gland produces too much. The conditions have different symptoms and ...
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