Tonsillar hypertrophy is mainly caused by tonsillitis, postnasal drip syndrome and immune overreaction. 1. Tonsillitis: the tonsils are located between the palatopharyngeal arch and the palatoglossal arch, and the surface is uneven, so it is easy for bacteria and viruses to stay and hide in them, and when one’s immunity decreases, it can cause inflammation of the tonsils, which leads to tonsillar hypertrophy. 2. Postnasal drip syndrome: In human anatomy, nasopharynx, oropharynx and laryngopharynx are connected, when patients suffer from rhinitis and other diseases, nasal secretions increase, and the secretions flowing into the oropharynx are retained in the tonsils, which stimulate the tonsils and cause tonsil hypertrophy. 3. Excessive immune response: the tonsils are important immune organs of the human body, when the tonsils encounter sensitizers, produce antigens, triggering an allergic reaction, can cause tonsil hypertrophy. Tonsil hypertrophy, should be actively hospital consultation, clear diagnosis, under the guidance of professional doctors treatment.