If you are not allergic to it, you can eat watermelon in moderation, but watermelon does not have a therapeutic effect, and tonsillitis should be treated regularly as prescribed by a doctor. Watermelon contains a lot of water, sugar, dietary fiber and a variety of vitamins, which can supplement water and vitamins and other nutrients for children with tonsillitis. Moderate consumption of watermelon can also relieve the pain and dryness of the throat caused by tonsillitis. However, because watermelon itself contains more sugar, children must rinse their mouths or brush their teeth in time after eating watermelon. Watermelon may cause diarrhea, abdominal pain and other discomforts in children if too much is ingested. Watermelon does not have a therapeutic effect, and children with tonsillitis should also be treated with anti-inflammatory and decongestive treatments. Children should follow the doctor’s instructions, not self-medication.