Subacute thyroiditis (subacute thyroiditis) is most often seen in adults between the ages of 30 and 50, with a higher incidence in women than in men. The disease is generally thought to be associated with viral infections, as most patients develop it secondary to influenza. Viral infections such as mumps. The clinical symptoms of subxiphoid arthritis vary widely, with some having rapid local enlargement of the thyroid gland and severe pain as the main manifestation, while systemic symptoms are not very obvious; others ignore the local symptoms and signs of the thyroid gland because of the rapid onset of the disease and particularly severe systemic symptoms. The acute onset of a typical subacute nail infection is usually acute, with chills and fever. Upper respiratory symptoms such as sore throat are present. The most characteristic manifestation is a painful enlargement of the thyroid gland, which may start on one side, then expand to the other side, and then involve the whole thyroid gland, or a swelling of the thyroid gland that grows and grows, with a hard texture that moves up and down with swallowing movements. Localized pain in the thyroid gland is manifested as spontaneous pain. Radiological pain and tenderness are evident. The surrounding lymph nodes are not enlarged, and when the pain is severe, it may radiate along the neck to the jaw. The pain may increase when chewing, swallowing, eating, coughing, turning the neck or making a head-down movement. At this time, most of the patients also have manifestations of hyperthyroidism, such as palpitations, fear of heat, excessive sweating, and easy to eat. There is an increase in the number of bowel movements, weight loss, nervousness, irritability, and hand tremors. When subacute thyroiditis enters remission, the painful swelling of the thyroid gland gradually decreases and the patient often shows signs of hypothyroidism, such as fatigue and weakness. Drowsiness, aversion to cold and warmth. Pale face, loss of appetite, abdominal distension, constipation, swelling, weight gain, etc. This is due to the destruction of thyroid cells due to inflammation and depletion of thyroid hormones. If any of the above symptoms occur after a cold go to the hospital promptly to minimize suffering.