Confused over thyroid test results Dealing with hair loss caused by thyroid medication Do I have an underactive thyroid?
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Hypothyroidism, or underactive thyroid, develops when the thyroid gland fails to produce or secrete as much thyroxine (T4) and triiodothyonine (T3) as the body needs.
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If the TSH level is high this means that you are not having adequate thyroxine to allow for your underactive thyroid gland.
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My Mom 's got an over-active thyroid and I 'm worried My twin sister has an underactive thyroid....
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My Mom's got an over-active thyroid and I'm worried My twin sister has an underactive thyroid... .