Peritonsillar Abscess (Quinsy): Symptoms, Causes and Treatment in the UK

A peritonsillar abscess, clinically known as quinsy, is a painful, pus-filled pocket that forms near one of your tonsils. It most frequently occurs as a complication of acute tonsillitis. While tonsillitis involves inflammation of the tonsils themselves, quinsy occurs when the infection spreads into the surrounding soft tissue, creating a localised abscess.

According to NHS data, quinsy is most common in teenagers and young adults, though it can affect anyone who suffers from recurrent tonsillitis. Because the abscess creates significant swelling, it can cause the uvula (the small fleshy piece hanging at the back of the throat) to be pushed to one side. If left untreated, the swelling can become severe enough to obstruct the airway, making it a condition that requires prompt medical evaluation.

The symptoms of quinsy usually follow a period of standard sore throat or tonsillitis symptoms that suddenly worsen on one side. Key signs to look out for include:

• Severe unilateral throat pain: Intense pain that is almost always limited to one side of the throat.
• Trismus: Difficulty or pain when trying to open the mouth or jaw.
• 'Hot potato' voice: A peculiar change in voice quality, sounding muffled as if you are speaking with a hot potato in your mouth.
• Dysphagia: Significant difficulty swallowing, often leading to drooling because the patient cannot swallow their own saliva.
• Swollen glands: Painful, enlarged lymph nodes in the neck and under the jaw.
• Fever and rigors: A high temperature (above 38°C) accompanied by shivering and general malaise.
• Bad breath (halitosis): A distinct, unpleasant odour caused by the infection.

The primary cause of quinsy is a bacterial infection, most commonly Group A Streptococcus, the same bacteria responsible for 'strep throat'. In the UK, NICE (National Institute for Health and Care Excellence) guidelines suggest that while most sore throats are viral, bacterial infections that penetrate deeper than the tonsillar surface can lead to abscess formation.

Common Risk Factors

• Recurrent tonsillitis: Frequent bouts of tonsil inflammation increase the likelihood of a complication.
• Incomplete antibiotic courses: Failing to finish a prescribed course of antibiotics for a throat infection can allow bacteria to linger and form an abscess.
• Smoking: There is some evidence suggesting that smokers are at a higher risk of developing quinsy.
• Glandular fever: Occasionally, the Epstein-Barr virus can lead to secondary bacterial infections in the throat.
• Chronic periodontal disease: Underlying gum or dental issues can sometimes contribute to the spread of bacteria in the oral cavity.

Diagnosis is primarily clinical, meaning a doctor will examine the back of your throat. They will look for swelling in the peritonsillar area and check if the uvula has shifted. In some cases, a needle aspiration may be performed to confirm the presence of pus.

Medical Treatment

Unlike a standard sore throat, quinsy cannot be managed with over-the-counter paracetamol alone. Treatment usually involves:

• Drainage: The most common procedure is 'needle aspiration' or 'incision and drainage', where a specialist (ENT) numbs the area and removes the pus.
• Antibiotics: High-dose antibiotics are required, often administered intravenously (via a drip) in a hospital setting for 24 hours before switching to oral tablets (such as phenoxymethylpenicillin or co-amoxiclav) for at least 10 days.
• Steroids: Corticosteroids may be prescribed to reduce the significant swelling and help the patient swallow and breathe more easily.
• Pain Relief: Stronger analgesics may be required initially to manage the intense localised pain.

Long-term, if you suffer from recurrent quinsy or tonsillitis, an NHS GP may refer you for a tonsillectomy (surgical removal of the tonsils) to prevent future occurrences.

If you are experiencing a sore throat that is rapidly getting worse on one side, speaking to an online doctor in the UK can be a vital first step. While an online GP cannot perform the physical drainage required for a confirmed abscess, they can provide a rapid triage assessment.

During a video consultation, a doctor can observe the back of your throat and assess your ability to speak and swallow. They can help differentiate between standard tonsillitis and the early stages of a peritonsillar abscess. If quinsy is suspected, the online doctor can provide a formal referral letter or advise you to attend the nearest Emergency Department (A&E) or a Specialist ENT (Ear, Nose, and Throat) emergency clinic. This ensures you receive the correct level of urgent care without delay, which is critical in preventing serious complications like sepsis or airway blockage.

Following the drainage of a peritonsillar abscess, patients usually feel a significant and immediate reduction in pain. However, the recovery process continues for several days:

• Complete the full antibiotic course: This is essential to ensure the infection does not return.
• Hydration: Drink plenty of fluids to prevent dehydration, especially if swallowing was difficult before treatment.
• Soft foods: Stick to a soft diet (custard, mashed potatoes, soup) for 3-5 days while the throat area heals.
• Oral hygiene: Use warm salt-water gargles or antiseptic mouthwashes to keep the area clean.
• Rest: Take time off work or school to allow your immune system to recover.