Subacute thyroiditis is clinically referred to as subacute thyroiditis, and the diagnosis needs to be confirmed on the basis of the patient’s medical history, clinical manifestations, physical signs, and relevant auxiliary examinations. Patients with subacute thyroiditis usually have a history of respiratory viral infection before the onset of the disease, and the clinical manifestations include neck pain, which may also be accompanied by headache and radiating pain behind the ear. There may also be systemic symptoms, such as malaise, fever, loss of appetite, tachycardia, and excessive sweating. Moreover, the patient’s thyroid gland may be palpably enlarged, indurated, and hard. In addition, a white blood cell test is needed to determine whether subacute thyroiditis has occurred. The concentration of leukocytes in the blood is normal or mildly elevated, and there is accelerated blood sedimentation. Ultrasonography of the thyroid gland may suggest a sheet-like hypoechoic inflammatory manifestation in the thyroid gland. Serum thyroid hormone concentration is elevated, thyroid iodine uptake rate is significantly lower than normal, and two-way separation can confirm the diagnosis of subacute thyroiditis. Subacute thyroiditis needs to go to the hospital in time to improve the examination, if the diagnosis of subacute thyroiditis, should actively cooperate with the doctor standardized treatment.