Tonsillitis: Why It Returns and When Tonsils Come Out

A single episode of tonsillitis is a sore throat that resolves. The questions that actually trouble people are different ones: why it comes back four times a year, why the antibiotic that worked in March did nothing in September, what the foul-smelling white lumps are, and whether the tonsils should simply come out.

This article is about the tonsils as an organ and about repeated and persistent disease. For a single acute sore throat — whether it is bacterial or viral, and whether it needs an antibiotic at all — the separate article on pharyngitis covers that decision in detail.

🛡️ What tonsils actually do

The palatine tonsils sit at either side of the back of the throat and are part of a ring of lymphoid tissue guarding the entrance to the airway and digestive tract, alongside the adenoids above and the lingual tonsil at the base of the tongue.

Their function is immunological sampling. Air and food pass directly over them, and their surface is folded into deep clefts called crypts that dramatically increase the area exposed. Immune cells sitting in those crypts encounter incoming organisms and generate a response. In early childhood, when almost every organism encountered is new, this work is substantial, which is why tonsils are proportionally largest between roughly three and seven years old and shrink steadily after puberty.

The crypts are also the source of most tonsil problems. A deep, folded, moist surface traps debris, harbours bacteria that are difficult to reach, and permits biofilm formation. The same architecture that makes tonsils good at immune surveillance makes them good at sheltering organisms.

The often-asked question of whether removing them harms immunity has a reassuring answer: the rest of the immune system compensates fully, and no meaningful long-term immune deficiency follows tonsillectomy. Tonsils are useful, not essential, and by adulthood their contribution is small.

🔁 Why it keeps coming back

Recurrence has three main explanations, and distinguishing them changes what to do.

Beta-lactamase producing neighbours

The tonsil crypts in someone with repeated infection are not sterile between episodes. They are colonised by organisms including Staphylococcus aureus, Haemophilus influenzae, Moraxella catarrhalis and various anaerobes, many of which produce beta-lactamase — an enzyme that breaks the chemical ring penicillin depends on.

These organisms are not themselves causing the tonsillitis. They simply destroy the penicillin in the immediate vicinity, so the streptococcus that is causing it survives a drug to which it remains fully sensitive. The phenomenon has a name, indirect pathogenicity, and it accumulates with each course of antibiotics a person takes.

The practical consequence is that plain penicillin or plain amoxicillin, entirely correct for a first episode, becomes progressively less reliable with repeated episodes, while an agent protected against the enzyme continues to work.

Biofilm in the crypts

Bacteria within the crypts organise into biofilm — a structured community embedded in a protective matrix, in which organisms are dramatically less susceptible to antibiotics than the same organisms floating free. Biofilm has been demonstrated on the tonsils of people with recurrent tonsillitis considerably more often than in controls. It explains why an infection can be suppressed repeatedly yet never eliminated.

The carrier state

Between five and twenty percent of children carry group A streptococcus in the throat continuously without being ill. A carrier who then catches an ordinary viral sore throat has a positive swab, gets an antibiotic, and appears to have had bacterial tonsillitis — and the pattern repeats with every viral illness, producing an apparent history of recurrent streptococcal tonsillitis that is nothing of the sort.

Carriers are at very low risk of complications and are not meaningfully contagious. Repeatedly treating them achieves nothing and costs a great deal in antibiotics.

📊 Acute, recurrent and chronic are different problems

The last row matters because it inverts a common assumption. Most tonsillectomies performed now are not for infection at all but for obstructed breathing during sleep, and the two situations have almost nothing in common apart from the organ involved.

💊 Antibiotics: which, and which not

Where a bacterial cause is established, treatment aims to shorten the illness modestly, reduce transmission, and prevent the uncommon complications.

The last row is worth stating plainly because macrolides are frequently used as a default. Azithromycin is a legitimate option for someone with a genuine penicillin allergy and it is not a first choice for anyone else, precisely because it is one of the few antibiotic classes to which group A streptococcus has developed meaningful resistance. Reaching for it routinely wastes a drug that is needed for the people who cannot take penicillin.

Ten days, not five. Streptococcal throat infection is one of the conditions where the longer course genuinely matters, because eradicating the organism — rather than merely relieving symptoms — is what prevents rheumatic fever. Symptoms settle in two or three days and the remaining seven are doing different work.

Two further points about glandular fever. It causes an enlarged spleen in many cases, which is vulnerable to rupture from a blow, so contact sports are avoided for at least three to four weeks. And the fatigue outlasts the sore throat by weeks or occasionally months, which is normal and not a sign that something was missed.

🚨 Quinsy — the complication to recognise

A peritonsillar abscess, traditionally called quinsy, is a collection of pus in the tissue beside a tonsil. It is the commonest serious complication of tonsillitis and it is recognisable if you know what to look for.

Quinsy does not resolve on oral antibiotics alone. It requires the pus to be drained, and it is a same-day problem rather than a wait-and-see one. Untreated it can extend into the deep spaces of the neck, which is a far more serious situation.

One rare complication deserves naming because it affects exactly the age group who assume a sore throat is trivial. Lemierre syndrome is an infection, usually with Fusobacterium necrophorum, that spreads from the throat into the internal jugular vein, causing clots that seed infection to the lungs and elsewhere. It occurs in previously healthy teenagers and young adults, and the pattern is a sore throat that seems to be settling followed several days later by high fever, rigors, neck pain and breathlessness. It is uncommon and it is a medical emergency.

🪨 Tonsil stones

Tonsilloliths are among the most searched and least explained tonsil problems, and they are usually far more distressing than they are dangerous.

They form when the crypts trap a mixture of shed cells, food particles, mucus and bacteria, which compacts and gradually calcifies into firm white or yellowish lumps. They are not infection and they are not a sign of poor hygiene.

What makes them memorable is the smell. Anaerobic bacteria within them produce volatile sulphur compounds — the same chemistry responsible for the odour of rotten eggs — which is why a stone the size of a grain of rice can cause halitosis out of all proportion to its size, and why the person who coughs one up rarely forgets it.

Typical symptoms are persistent bad breath resistant to brushing and mouthwash, a sensation of something stuck in the throat, occasional mild ear pain, and visible white specks in the tonsils.

A stone that grows large, causes persistent one-sided discomfort, or is accompanied by an ulcer or a lump that does not settle deserves examination rather than home management, since a persistent one-sided tonsil abnormality is one of the presentations of something more serious.

✂️ When tonsils should come out

Tonsillectomy is a real operation with a genuinely unpleasant recovery, and the decision rests on whether the disease is severe enough to justify it. Modern criteria exist precisely because it was for decades performed far too readily.

The widely used thresholds for recurrent infection are:

Crucially, the episodes have to be real ones — documented, with fever, tonsillar exudate, swollen tender neck glands or a positive streptococcal test, rather than every occasion of a scratchy throat. This is why keeping a written record with dates matters: a person who has genuinely met the threshold and cannot demonstrate it is in a much weaker position when the question is considered.

Other accepted indications: recurrent peritonsillar abscess, obstructive sleep-disordered breathing from enlarged tonsils, persistent chronic tonsillitis unresponsive to treatment, marked asymmetry or a suspicious appearance requiring tissue diagnosis, and tonsil stones severe enough to affect daily life after other measures have failed.

The honest position on benefit is that it is clear and substantial in severely affected people, and modest in those who only just meet the criteria. In adults with borderline frequency, the number of sore throats avoided over the following years is smaller than most expect, and worth weighing against two weeks of significant pain.

😴 Children, breathing and sleep

The commonest reason for tonsil surgery in children today has nothing to do with infection. Enlarged tonsils and adenoids narrow the airway, and during sleep, when muscle tone falls, that narrowing can obstruct breathing repeatedly through the night.

What parents notice: loud habitual snoring, visible pauses in breathing followed by a gasp, restlessness and unusual sleeping positions with the neck extended, mouth breathing, and sweating during sleep.

What is less often connected to it: daytime irritability, poor concentration, hyperactivity, difficulties at school, bedwetting that had stopped, and in some children slowed growth. Children with disrupted sleep frequently present as overactive rather than tired, which is the opposite of the adult pattern and the reason the cause is missed.

Over years, chronic mouth breathing also affects the development of the face and the alignment of teeth.

Removing tonsils and adenoids in a child with genuine obstructive sleep-disordered breathing produces among the most striking results in routine surgery — sleep, behaviour, concentration and often growth improve substantially. This is a situation where the operation is straightforwardly worth it, and a child who snores loudly every night with pauses deserves assessment rather than reassurance.

🧊 Relieving the symptoms

Whether or not antibiotics are involved, the throat has to be got through, and some measures work considerably better than others.

Anti-inflammatory painkillers outperform paracetamol for throat pain in direct comparison, because the pain is substantially inflammatory. Either is reasonable, and ibuprofen is generally more effective if there is no reason to avoid it.

A single dose of an oral corticosteroid is well supported for severe sore throat, reducing the time to meaningful relief. It is a prescribed intervention rather than a self-administered one, and worth knowing exists when the pain is severe enough to prevent drinking.

Salt water gargling is cheap, safe and modestly effective. Half a teaspoon in a glass of warm water, several times daily.

Lozenges containing a local anaesthetic or anti-inflammatory provide short-lived but real relief, and matter mainly by making swallowing possible.

Cold rather than hot suits most people, and ice lollies are genuinely useful in children who will not drink.

Fluids above everything. The commonest reason a child with tonsillitis needs hospital admission is not the infection but dehydration from refusing to swallow. Regular small amounts, timed to follow a dose of painkiller when the throat is at its least sore, work far better than urging large drinks.

Honey soothes and has modest evidence behind it, and is not given to infants under one year.

🔬 The complications antibiotics are actually for

Sore throats are treated with antibiotics largely to prevent two things, and their frequency has changed enormously.

Rheumatic fever is an immune reaction following streptococcal infection that can damage heart valves permanently. It is now rare in high-income countries and remains a major cause of heart disease in many parts of the world. Antibiotic treatment of streptococcal throat infection reduces the risk, and this is the principal reason for the ten-day course.

Post-streptococcal glomerulonephritis affects the kidneys and appears one to two weeks afterwards with dark urine, facial puffiness and raised blood pressure. Notably, antibiotic treatment does not reliably prevent it, so it is not an argument for treating every sore throat.

Alongside these sit the local complications — peritonsillar abscess, spread into the deep neck spaces, and the rare Lemierre syndrome described above — which are the ones most likely to be encountered in practice.

📋 A practical approach

For a first or occasional episode, establish whether it is bacterial before treating, and treat symptoms properly regardless. The pharyngitis article sets out how that decision is made.

If an antibiotic is indicated for a first episode, penicillin or amoxicillin for ten days, completed.

If this is a repeat episode or the last course failed, a protected agent is the rational choice, because the problem is almost certainly enzyme production in the crypts rather than resistance in the streptococcus.

Keep a written record with dates, temperature and what was found. It is what determines whether surgery is available later.

Look for the treatable contributors — smoking and vaping, untreated reflux, poor dental health, and chronic nasal obstruction forcing mouth breathing all sustain tonsil problems.

If episodes meet the thresholds, or breathing is obstructed at night, ask for an ENT opinion rather than accepting a fifth course of antibiotics in a year.

🩺 When to seek medical care

• Difficulty breathing, or drooling because swallowing is impossible — emergency
• Inability to open the mouth fully, with one-sided pain and a muffled voice — likely quinsy, same day
• Neck swelling, stiffness, or a swollen tender area below the jaw
• Unable to drink, or signs of dehydration in a child
• A sore throat lasting beyond a week, or getting worse after appearing to improve
• High fever with rigors several days after a sore throat seemed to settle
• A rash after taking amoxicillin for a sore throat — this needs correctly identifying rather than a lifelong allergy label
• One tonsil persistently larger than the other, or an ulcer that does not heal
• Loud snoring with pauses in breathing, in a child or an adult
• Repeated episodes approaching the surgical thresholds

Treatment is stocked in the antibiotics category, including Amoxyheal CV (amoxicillin with clavulanate) and Augmentin for recurrent disease, Amoxil (amoxicillin) for a first episode, Cleocin (clindamycin) where anaerobic cover is needed, and Zithromax (azithromycin) for those with a genuine penicillin allergy.

❓ Frequently asked questions

📑 Sources and editorial

• IDSA guideline on the diagnosis and management of group A streptococcal pharyngitis
• AAO-HNS clinical practice guideline on tonsillectomy in children
• Paradise criteria and subsequent trials of tonsillectomy for recurrent throat infection
• Research on beta-lactamase producing copathogens and indirect pathogenicity in recurrent tonsillitis
• Studies of tonsillar biofilm in recurrent and chronic tonsillitis
• Cochrane reviews of corticosteroids and of antibiotics for sore throat
• Surveillance data on macrolide resistance in group A streptococcus
• Literature on peritonsillar abscess and on Lemierre syndrome
• Evidence on adenotonsillectomy for paediatric obstructive sleep-disordered breathing
• Related reading: pharyngitis and the sore throat decision, what azithromycin is actually for
• Related products: antibiotics category
• RXshop Editorial Team — reviewed by Emily Chen, MD, MPH, Internal Medicine