Complications of acute tonsillitis are often more dangerous than acute tonsillitis itself, and they are significantly reduced due to the application of antibiotics. First, complications have local complications are more common and are caused by direct invasion of adjacent tissues by acute inflammation. This includes deep neck infections, most commonly peri-tonsillar abscesses, which can also cause pharyngeal abscesses as well as parapharyngeal abscesses. Acute tonsillitis can spread upward to cause acute otitis media, acute rhinitis, and sinusitis, and downward to cause acute laryngotracheitis, acute bronchitis, and even pneumonia and internal jugular vein thrombophlebitis. Second, systemic complications, the occurrence of systemic complications is generally considered to be related to the type I metamorphosis of the target organs to streptococci. 1, acute arthritis, often invading the shoulder, elbow, knee joints, small joints are less involved. 2, rheumatic fever, the symptoms of which appear 1-3 weeks after the onset of acute tonsillitis. 3, circulatory system diseases, can cause acute pericarditis, acute endocarditis, acute myocarditis or acute total heart inflammation. Cardiac complications are particularly common in those with rheumatic fever in acute tonsillitis.4. Acute nephritis, which occurs 2-3 weeks after acute tonsillitis, can be complicated by acute urethritis, acute orchitis, and epididymitis.5. Others, including abscesses, sepsis, subacute thyroiditis, acute peritonitis, acute appendicitis, and acute cholecystitis.