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 ...
Thyroid stimulating hormone (TSH) tells the thyroid gland to produce hormones. High TSH levels usually indicate that the thyroid is underactive and needs more stimulation in order to work. But, some ...
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