Thyroiditis is categorized into acute thyroiditis, subacute thyroiditis, and chronic thyroiditis. The symptoms of acute and subacute thyroiditis often manifest initially like those of a viral infection, including cough, sore throat, fever, decreased appetite, muscle soreness, excessive sweating, and other symptoms of hyperthyroidism and upper respiratory infection. The treatment primarily involves symptomatic and supportive care, using antiviral medications since it is caused by viral infections. For patients with mild symptoms, non-steroidal medications are generally used, while corticosteroid treatment might be administered for moderate to severe cases. Symptoms of chronic thyroiditis, on the other hand, are generally not obvious in the early stages but in the late stages, they mainly present as symptoms of hypothyroidism, such as a sensitivity to cold, decreased appetite, slowed heart rate, and general edema. Hashimoto's thyroiditis might present as a moderately enlarged, hard thyroid gland, while atrophic thyroiditis shows symptoms associated with thyroid atrophy. Treatment mainly depends on thyroid function, supplementing thyroid hormones timely if hypothyroidism occurs. (Please consult a doctor before using any medications, and do not self-medicate.)