Hypothyroidism: Most hypothyroidism is caused by Hashimoto's thyroiditis, which causes progressive loss of thyroid function. Once you are fully hypothyroid, the gland will not usually come back. There is a condition called subacute thyroiditis, where the thyroid is painful, inflammed, maybe temporarily hypothyroid, but then heals. Postpartum thyroiditis can also behave like this.
Answered 2/13/2016
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