There is no cure for Hashimoto's thyroiditis. There is no way to know how long the autoimmune process and inflammation will continue. In the vast majority of patients, hypothyroidism results from the inflammatory process.
Thyroid hormone medication can replace the hormones the thyroid made before the inflammation started. There are two major thyroid hormones made by a healthy gland (T3 and T4). Replacing one or both of these hormones can alleviate the symptoms caused by the absolute or relative lack of hormones as a consequence of Hashimoto's thyroiditis.
Without medication, there is very little chance the thyroid would be able to maintain hormone levels within the normal range, and symptoms and signs of hypothyroidism would occur or worsen.
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