Tonsillitis

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Lymphatic system

Throat anatomy

Tonsillitis is inflammation (swelling) of the tonsils.

See also: Sore throat

The tonsils are lymph nodes in the back of the mouth and top of the throat. They normally help to filter out bacteria and other microorganisms to prevent infection in the body.

They may become so overwhelmed by bacterial or viral infection that they swell and become inflamed, causing tonsillitis. The infection may also be present in the throat and surrounding areas, causing inflammation of the pharynx. The pharynx is in the back of the throat, between the tonsils and the voicebox (larynx). See: Pharyngitis

Tonsillitis is extremely common, particularly in children.

Review Date: 12/01/2008
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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