Inflammation of one side of the tonsils is a common phenomenon when tonsillitis strikes, inflammation of the tonsils can be unilateral or bilateral, bacterial infection is a common cause of inflammation of the tonsils, in addition to the tonsil crypts, the tonsil stone depression retained pathogens, but also prone to lead to patients with tonsillitis. Inflammation of only one side of the tonsils is a common symptom when tonsillitis occurs. Bacterial infection is a common cause of tonsillitis, and Streptococcus b hemolyticus is the main causative organism of tonsillitis. In addition, pathogenic microorganisms, such as non-hemolytic streptococcus, staphylococcus, Streptococcus pneumoniae, bacillus influenzae, adenovirus, rhinovirus, herpes simplex virus, etc., can also cause tonsillitis. In addition, unilateral tonsillar crypts or tonsillar stone depressions retain certain pathogenic microorganisms, and the crypts do not drain well, the body’s immune system is reduced, can also lead to tonsillitis on one side of the symptoms of inflammation. When there are symptoms of inflammation on one side of the tonsil, it is recommended to consult a doctor and have a systematic examination to determine the cause and extent of the disease.