A peritonsillar abscess is a pocket of pus that forms in the tissue next to one of your tonsils, usually as a complication of a severe throat infection. It’s the most common deep infection of the head and neck in young adults, and it typically causes intense one-sided throat pain, difficulty swallowing, and a distinctive muffled voice sometimes called “hot potato voice.” While it sounds alarming, it’s very treatable when caught early.
How It Develops
Most peritonsillar abscesses start as a bad case of tonsillitis or strep throat. When bacteria from the tonsil surface push deeper into the surrounding soft tissue, they can create a walled-off collection of pus in the space between the tonsil and the muscles of the throat wall. This space is loose and flexible, which gives the infection room to expand before you might realize it’s more than an ordinary sore throat.
The abscess almost always forms on just one side. As pus accumulates, it pushes the affected tonsil inward and can shift the uvula (the small tissue flap hanging at the back of your throat) toward the opposite side. That displacement is one of the hallmarks a doctor looks for during an exam.
What It Feels and Looks Like
The pain is usually severe and concentrated on one side of the throat, noticeably worse than a typical sore throat. Swallowing becomes increasingly difficult, and many people start drooling simply because swallowing saliva hurts too much. You may also notice ear pain on the same side, since the throat and ear share nerve pathways.
One of the most recognizable signs is a change in your voice. The swelling interferes with how the soft palate moves, creating a temporary disconnect between the mouth and nasal passages. The result is a thick, muffled sound, as if you’re trying to talk around a hot piece of food. This “hot potato voice” is distinct from the general hoarseness of a regular sore throat and signals that the infection has spread beyond the tonsil itself.
Trismus, the inability to fully open your mouth, is another telltale symptom. The inflammation irritates the chewing muscles that sit close to the tonsil, making it painful or even impossible to open wide. Fever, swollen lymph nodes on the affected side, and general fatigue round out the picture.
How It’s Diagnosed
In many cases a doctor can diagnose a peritonsillar abscess just by looking at the throat and feeling the area. The classic findings include a bulging, red mass next to one tonsil, a shifted uvula, and limited mouth opening. If the picture is clear, no imaging is necessary.
When the diagnosis is uncertain, or if the abscess might be extending deeper into the neck, imaging can help. CT scans of the neck are highly accurate, with studies showing 100% sensitivity and specificity for identifying the abscess. Intraoral ultrasound, where a small probe is placed inside the mouth, has also shown 100% sensitivity in research settings and can be done quickly at the bedside without radiation. It’s especially useful for confirming whether pus is present before attempting drainage.
Draining the Abscess
Antibiotics alone rarely resolve a fully formed abscess. The standard treatment involves physically removing the pus, and there are two main ways to do it.
Needle aspiration uses a large needle inserted through the mouth to draw pus out of the abscess cavity. It’s a quicker, less invasive option. Studies show it’s less painful during the procedure, with patients rating pain about half a point lower on a 10-point scale compared to the alternative. About 75% of patients report no pain five days afterward.
Incision and drainage involves making a small cut in the abscess wall and letting pus drain freely, sometimes with gentle suctioning. It’s more thorough but more uncomfortable. In one study, roughly 61% of patients who had incision and drainage rated their pain as severe, compared to about 21% in the needle aspiration group.
The tradeoff is recurrence. A large Cochrane review pooling data from 10 trials found that abscesses came back about 3.7 times more often after needle aspiration than after incision and drainage. In real numbers, roughly 5 out of 100 patients who had incision and drainage experienced a recurrence, versus about 25 out of 100 who had needle aspiration. Both procedures get you back to eating normally in about the same timeframe, typically within 3 to 4 days.
Steroids for Faster Recovery
Adding a short course of anti-inflammatory steroids alongside drainage and antibiotics can meaningfully speed up recovery. A meta-analysis found that patients who received steroids were significantly more likely to open their mouths fully within 24 hours compared to those who didn’t. The improvement was measurable as early as 4 hours after treatment and continued to widen over the first day.
Swallowing followed a similar pattern. At 24 hours, a significantly higher percentage of steroid-treated patients could drink water without pain. The effect is thought to come from rapidly reducing the swelling around the abscess site, which eases pressure on the surrounding muscles and tissues.
Treatment in Children
Peritonsillar abscesses in children present a unique challenge. Young kids often can’t describe their symptoms precisely, making it harder to distinguish this condition from ordinary tonsillitis. And the bedside drainage procedures that work well in cooperative adults are frequently not feasible with younger children who can’t stay still for a needle or scalpel in the back of the throat.
Because of this, children are more likely to need drainage under general anesthesia. In the pediatric population, rates of surgical drainage (sometimes involving removal of the tonsil on the affected side at the same time) range from 10% to 68% depending on the center and the child’s age. This carries additional risks related to anesthesia and bleeding, so doctors weigh the decision carefully based on the child’s ability to cooperate and the size of the abscess.
Recurrence and Tonsil Removal
After a single episode, the chance of the abscess coming back depends heavily on your history of throat infections. One long-term study found that patients who had recurring bouts of tonsillitis before their abscess experienced recurrence rates of about 40%, compared to roughly 10% in those who had no prior history of frequent tonsillitis.
Tonsillectomy, performed 6 to 12 weeks after the abscess resolves, eliminates the problem entirely. In a group of 72 patients who had their tonsils removed after an abscess, none developed another abscess or further episodes of tonsillitis. Current thinking is straightforward: if you had recurrent tonsillitis before the abscess formed, tonsillectomy makes sense. If you had one isolated episode with no history of throat trouble, removing the tonsils typically isn’t warranted.