Subacute thyroiditis is a non-purulent thyroiditis with the highest incidence of painful thyroid diseases. The most characteristic manifestation is pain or pressure pain in the thyroid area, and often radiates to the lower jaw, behind the ear or neck, etc., which may be accompanied by fever, generalized weakness, etc. It is recommended to consult a doctor in time. Subacute thyroiditis is characterized by an acute onset of fever, accompanied by chills and generalized weakness. The most characteristic manifestation is pain or pressure pain in the thyroid gland, which often radiates to the submandibular region, behind the ears or the neck, and the pain is aggravated when swallowing. The scope of thyroid lesions varies, starting from one lobe and later expanding and transferring to another lobe, and the lesion gland is enlarged and hard, with significant pressure pain. When the lesion is extensive, thyroid hormones and non-hormonal iodinated proteins in the follicles are released into the circulation in large quantities on a temporary basis, so in addition to the systemic manifestations of infection, some patients may also be accompanied by the clinical manifestations of thyrotoxicosis in the first few weeks after the disease. If thyroid pain occurs, it is recommended to consult a doctor in time and analyze the cause of the disease through relevant examinations before targeting treatment.