Which tonsils are usually inflamed when tonsillitis occurs?

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Tonsillitis most often targets the palatine tonsils, the pair you can see on either side at the back of the throat. These tonsils sit right in the path of pathogens entering the mouth, making them the first line of immune defense in the oropharynx. Their surface has many crypts that trap bacteria and viruses, so when an infection takes hold, these tonsils become inflamed, red, and may develop pus. That swelling often leads to sore throat and painful swallowing, which are hallmark signs of acute tonsillitis.

Other tonsil groups aren’t usually the primary sites of tonsillitis. The pharyngeal (adenoids) sit higher up in the nasopharynx and are more commonly problematic in children with nasal obstruction or snoring. The lingual tonsils are at the base of the tongue, and the tubal tonsils near the auditory tubes; inflammation there is less common and can be linked to ear-related issues rather than the classic throat infection.