The peritonsillar space lies between each tonsil and the wall of the throat. An infection can cause a pus-filled swelling (abscess) to develop in this space. Peritonsillar abscesses, also called quinsy, usually occur as a complication of tonsillitis. They are most often caused by "strep throat" bacteria (group A beta-hemolytic streptococci). If a peritonsillar abscess is not treated promptly, the infection can spread to the neck, roof of the mouth and lungs. Swelling can push the tonsil into the center of your throat and move the uvula (the flap of tissue hanging in the back of your throat) from the center toward the unaffected side of your throat. In severe cases, swelling can make breathing difficult or can close your airway.

Peritonsillar abscesses are most often found in older children, adolescents and young adults. They are less common than in the past because tonsillitis is now often treated with antibiotics, which destroy the infection-causing bacteria.

Symptoms include:

• A very sore throat
• Difficulty swallowing or opening the mouth wide
• Swollen glands in the neck
• Headache
• Chills or fever
• Swelling of the face
• Specific changes in speech, sometimes called "hot potato voice" because it sounds as if you're talking around a mouthful of hot mashed potatoes

Your doctor will prescribe antibiotics to treat the infection. In severe infections, antibiotics may be given intravenously (into a vein). Usually, you will need to take antibiotics for at least 10 days. It is important to take all the medication prescribed, even if you start feeling better. Many abscesses do not respond to antibiotics alone and need to be drained. This can be done with a needle or by making a small incision in the abscess and suctioning out the fluid. This can be done in a doctor's office or emergency room, but occasionally may need to be done in an operating room, especially if the infection has extended down into your neck. Your doctor will provide sedation and pain medication to make you comfortable during this procedure. Because the symptoms make it difficult to eat or drink, some people need intravenous fluids (injected into a vein) to treat or prevent dehydration.

If tonsillitis or a peritonsillar abscess keeps coming back, you may need to have your tonsils surgically removed in a procedure called a tonsillectomy.