In clinical practice, thyroiditis usually consists of three types: 1. Acute septic thyroiditis: This is caused by a secondary bacterial infection caused by skin rupture, resulting in the formation of an abscess, which can even cause sepsis if left untreated, and can cause asphyxia if the symptoms are severe and compress the airways; 2. Subacute thyroiditis: This is usually caused by a virus that destroys the thyroid follicles secondary to an upper respiratory tract infection, and most symptoms are mild when left untreated. Most of the symptoms are mild and can heal on their own without treatment. If the symptoms are severe, because the pain is intense, or the virus destroys too many thyroid follicles, untreated will lead to chronic pain in the neck, seriously affecting the quality of life; 3, chronic lymphocytic thyroiditis: if chronic lymphocytic thyroiditis leads to hypothyroidism, usually need to supplement thyroxine treatment, if not supplemented thyroxine will usually appear weak and drowsy, depression, loss of appetite If thyroxine is not supplemented, symptoms such as lethargy, drowsiness, depression, loss of appetite, weight gain, and swelling usually occur.