Thyroiditis refers broadly to inflammation of the thyroid gland, which is not a single disease but a large group of diseases with a variety of clinical classifications. Most thyroiditis has similar symptoms, with an insidious onset and no specific symptoms in the early stages, making it difficult to detect, and some patients even remain undetected, known as asymptomatic first thyroiditis. Patients who are detected usually go through a process of conversion from hyperthyroidism to hypothyroidism, in addition to the painful enlargement caused by the inflammation of the thyroid gland itself. Because inflammation destroys the thyroid follicles, stored thyroid hormones leak into the bloodstream and symptoms of hyperthyroidism appear, but because the destroyed follicles are unable to continue to secrete, they turn into hypothyroidism due to insufficient thyroid hormones. Some types of thyroiditis can restore follicular function, but others can become lifelong hypothyroidism. ? There is also acute septic thyroiditis, which is a rare or rare inflammation of the thyroid gland, but with significant symptoms and early detection. It is mainly seen in children, mostly due to abnormal thyroid development or with other abnormalities of the neck, followed by a secondary bacterial infection, such as abnormal development of the cheek cleft. It may have an acute onset with high fever and blood work consistent with septic inflammatory changes, but nail function is generally normal. Local manifestations are a painful mass on one side of the thyroid gland found on palpation, its skin appearance is congested and red, and the pressure pain is intense and high tension. Therefore, thyroiditis is a large group of diseases with multiple etiologies, and most types have an insidious onset and are difficult to detect early.