Peritonsillar abscess is a bacterial infection. It develops on the side of the throat, behind or above the tonsils. The infection causes a pocket of pus to form. This type of abscess usually happens on one side of the throat or the other.

The condition is more common in young adults. It can also occur in children.

The Tonsils
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The abscess is caused by bacteria. It is usually a complication of another illness.