It is possible to have mild halitosis within two weeks after tonsil surgery, especially when heat-scalding instruments such as low-temperature plasma and ultrasonic knife are used in the process of removal. It is mainly caused by protein denaturation of the mucosa in the tonsil fossa, but it will not be particularly pronounced and will not be accompanied by recurrent febrile symptoms, and can be relieved by paying attention to mouth rinsing and maintaining oral hygiene. If bad breath is particularly severe, accompanied by recurrent high fever symptoms, the possibility of local traumatic infection needs to be ruled out, and the peritoneum of the tonsils is found to be black and dark during physical examination, and at this time, active antibiotics of sensitive class should be used, and glucocorticoids should be used as appropriate to control the infection. If the treatment is not timely, it can cause infectious shock or infectious diseases of the surrounding tissues.