Subacute thyroiditis generally refers to subacute thyroiditis, which is a self-limiting disease, and goiter is usually recoverable. Subacute thyroiditis is a kind of self-limited thyroiditis related to viral infection, the onset of the disease is often acute, the most characteristic manifestation is the pain or pressure pain in the thyroid area, and often radiates to the submandibular region, behind the ear or neck, and the pain is aggravated by swallowing; the diseased glands are enlarged, hard, and with significant pressure pain. As this disease is a self-limiting disease, symptoms such as goiter can gradually improve, and thyroid function can return to normal in most patients, while hypothyroidism may persist or recur in a few patients. The duration of the disease varies from a few weeks to more than half a year, usually about 2 to 3 months. Patients diagnosed with subacute thyroiditis should actively cooperate with their doctors.