When your thyroid is underactive -- hypothyroidism (some people refer to it as "low thyroid") -- the medical treatment is a prescription thyroid hormone replacement drug. Whether you're hypothyroid because you have autoimmune Hashimoto's disease, or you've had radioactive iodine (RAI) treatment for Graves' disease/hyperthyroidism, you were born with congenital thyroid defects, or had your thyroid removed surgically, you are now hypothyroid. You need to replace the missing thyroid hormone, and that's where thyroid hormone drugs come in. I've put together a helpful overview of thyroid hormone replacement.
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