The period of hypothyroidism in subacute thyroid is maintained for about 1-2 months, which varies from person to person, and lasts longer in patients with more severe disease. However, no matter how long it lasts, hypothyroidism caused by subacute thyroiditis, the patient’s thyroid function will eventually return to normal levels gradually, without the need for oral euthyroid replacement therapy. However, some patients with subacute thyroid have been seen to develop permanent hypothyroidism. These patients also have elevated levels of thyroglobulin antibodies or thyroid peroxidase antibodies in their blood, which is actually Hashimoto’s thyroiditis combined with subacute thyroiditis.