Chronic tonsillitis is not necessarily caused by streptococcal infection, but the possibility of other bacterial infections should also be considered. In addition, viral infections, parasitic infections and other diseases can also cause chronic tonsillitis. 1. Bacterial infections: The most common causative agent is Streptococcus B hemolyticus. In addition, other bacteria, such as staphylococcus, may also cause the disease. 2. Bacterial infections: such as rhinovirus, adenovirus, herpes simplex virus infection. 3. Parasitic infections: such as Toxoplasma gondii infection, which can also cause chronic tonsillitis. 4. Other diseases: such as acute pharyngitis, rhinitis spread to the surrounding organs, which in turn causes chronic tonsillitis. It is recommended that patients seek timely medical attention to clarify the cause of the disease and under the guidance of the doctor for treatment.