1. What is tonsillitis in children? Tonsillitis in children is a disease caused by infection of the tonsils. Tonsils are part of the body\’s immune system, located in the oropharynx, and have filtering and defensive functions. When bacteria or viruses invade the tonsils, they can cause swelling and inflammation of the tonsil tissue, leading to symptoms such as fever and sore throat. 2. Common causes of tonsillitis in children 1. Bacterial infection: The most common bacteria are Streptococcus. 2. Viral infection: such as adenovirus, influenza virus, etc. 3. Air pollution: inhaled into the air