Enlarged tonsils in a three-year-old child may be caused by inflammation of the tonsils, which needs to be treated with medication or surgery depending on the severity of the inflammation. Enlarged tonsils are one of the more common diseases in clinical practice, usually occurring in children’s groups. The resistance of infants and young children is relatively poor, and they are prone to recurrent inflammation, in which case the tonsils become enlarged after being stimulated by repeated inflammation. Enlarged tonsils can be treated with antibacterial and anti-inflammatory drugs, if children’s tonsils are very obviously enlarged, and pus, children’s blood count is very high, we should give children timely application of antibacterial drugs such as amoxicillin. For long-term recurrent chronic tonsillitis, if the enlargement causes more serious respiratory obstruction, poor swallowing, dysphonia, etc., tonsil removal can be considered. Children with enlarged tonsils need timely treatment, the above medication needs to be under the guidance of a doctor.