What causes quincy

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Last updated: April 4, 2026

Quick Answer: A quinsy, also known as a peritonsillar abscess, is a collection of pus that forms at the back of the throat, next to one of the tonsils. It is typically a complication of untreated or inadequately treated tonsillitis or pharyngitis, often caused by bacterial infections like Streptococcus pyogenes.

Key Facts

What is a Quinsy?

A quinsy, medically termed a peritonsillar abscess, is a serious medical condition characterized by the formation of a pocket of pus in the tissues around the tonsils, specifically in the peritonsillar space. This space is located behind the tonsil and above the soft palate. While tonsillitis (inflammation of the tonsils) and pharyngitis (inflammation of the throat) are common and often resolve on their own or with antibiotics, a quinsy represents a more severe complication where the infection spreads beyond the tonsil into the surrounding tissues, leading to abscess formation.

Causes of Quinsy

The primary cause of quinsy is bacterial infection. The most common culprit is Streptococcus pyogenes, also known as Group A Streptococcus, the same bacterium responsible for strep throat. Other bacteria can also contribute to the development of a peritonsillar abscess. The infection typically begins as tonsillitis or pharyngitis. When this infection is not adequately treated with antibiotics, or if the treatment is delayed, the bacteria can penetrate the tonsillar tissue and spread into the adjacent peritonsillar space. This invasion triggers an inflammatory response, and the body's immune system attempts to wall off the infection, resulting in the accumulation of pus.

Factors that can increase the risk of developing a quinsy include:

Symptoms of Quinsy

The symptoms of a quinsy usually develop quite rapidly, often over a period of a few days, and can be quite severe. The hallmark symptom is intense, often unilateral (one-sided) throat pain. This pain may worsen when swallowing, talking, or even opening the mouth wide. Other common symptoms include:

It is important to note that one side of the throat may appear more swollen than the other, and the uvula (the fleshy extension at the back of the soft palate) may be pushed to the opposite side by the abscess.

Diagnosis and Treatment

Diagnosing a quinsy typically involves a physical examination of the throat, where a doctor can observe the swelling and redness. Imaging tests, such as a CT scan or ultrasound of the neck, may be used to confirm the presence and extent of the abscess, especially if the diagnosis is unclear. A needle aspiration, where a small amount of pus is drawn from the abscess, can also aid in diagnosis and provide a sample for culture to identify the specific bacteria causing the infection.

Treatment for quinsy is urgent and usually involves two main steps:

  1. Drainage of the abscess: The pus needs to be removed to relieve pressure and reduce the infection. This can be done through needle aspiration or by making a small incision to drain the abscess.
  2. Antibiotics: A course of antibiotics is prescribed to fight the underlying bacterial infection and prevent it from spreading further or recurring. Intravenous antibiotics may be necessary in severe cases.

Pain management is also a crucial part of treatment, and patients may be given pain relievers. In some cases, particularly for individuals with recurrent tonsillitis, a tonsillectomy (surgical removal of the tonsils) may be recommended after the abscess has resolved to prevent future occurrences.

Potential Complications

If left untreated, a quinsy can lead to serious complications. The infection can spread to other parts of the neck and head, potentially causing:

Prompt medical evaluation and treatment are therefore essential for a favorable outcome.

Sources

  1. Peritonsillar abscess - WikipediaCC-BY-SA-4.0
  2. Quinsy - NHSfair-use
  3. Peritonsillar abscess: MedlinePlus Medical Encyclopediafair-use

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