A sore throat in a small child throws a household off. They will not eat, the fever bounces overnight, swallowing hurts, and the question every parent ends up at by morning is the same: do they need antibiotics, or are we just supposed to wait it out?
The honest answer is that for most children with tonsillitis, the virus runs its course in under a week and antibiotics make no difference. For a meaningful minority, it is bacterial — usually strep — and antibiotics shorten the illness and prevent rare but serious complications. Telling the two apart is partly clinical pattern recognition and, when in doubt, a quick throat swab.
Healthbooq helps parents read childhood illnesses in plain terms — including the lines that should send you to the GP today, not tomorrow.
What You Are Looking At
Open a child's mouth and the tonsils are the two pads of pink tissue on either side of the back of the throat — sometimes you can see them, sometimes they are tucked behind the soft palate. In tonsillitis they swell up, often turn beefy red, and frequently end up flecked with white-yellow pus that looks like cottage cheese on the surface. Add fever, painful swallowing, breath that smells off, and a child who suddenly will not eat — that is the classic picture.
Tonsillitis is most common between ages three and seven. In a baby under one, a high fever with throat findings always needs a doctor's eyes, because the differential is wider and the threshold for review is lower.
Viral or Bacterial?
Roughly two-thirds of tonsillitis episodes are viral — the same rhinoviruses and adenoviruses that cause everyday colds, plus EBV (glandular fever) in older children, which is its own picture of long fatigue and big neck glands. Viruses do not respond to antibiotics; throwing amoxicillin at glandular fever, in particular, can produce a dramatic rash that is sometimes mistaken for an allergy.
The remaining third are bacterial, and almost all of those are Group A streptococcus. Strep tonsillitis is the one that genuinely changes with treatment: penicillin V or amoxicillin for 10 days, finished even after the child feels better, because the reason for the full course is preventing the rare downstream complications (rheumatic fever, post-streptococcal kidney inflammation), not just speeding the throat.
The clues that nudge toward bacterial:
- No cough.
- Pus visible on the tonsils.
- Tender, swollen glands at the front of the neck.
- Fever over 38°C.
- Suddenly hits, with throat pain leading the picture.
The clues that nudge toward viral:
- A cough or runny nose came first.
- Mouth ulcers, red eyes, hoarse voice.
- A whole-body cold rather than a throat-led illness.
GPs in the UK formalise this with the FeverPAIN or Centor scores. A high score makes a swab or empirical antibiotics reasonable; a low score makes watchful waiting the better call. A throat swab cuts through the guesswork — it adds a couple of days, but it stops a lot of unnecessary antibiotics being prescribed.
How to Make Them Comfortable
The illness is uncomfortable but not dangerous in a child who can keep drinking. The priorities for the first few days are pain control and hydration:
- Paracetamol and ibuprofen at age- and weight-appropriate doses, alternated if needed for round-the-clock cover. Both bring fever down and reduce throat pain — which is what gets them swallowing again.
- Cold soft things help: ice lollies, ice cream, yoghurt, smoothies, cold milk. The cold soothes the throat and the calories matter when proper meals are off the table.
- Anything sharp or salty — crisps, citrus, toast crusts — will be miserable. Skip them.
- Plenty of fluids in any form they will take. Even small sips through a straw count.
- Rest, and accept that two or three days of less appetite are normal. They will catch up later.
Throat sprays and lozenges marketed for adults are mostly unsuitable for children under six (choking risk for lozenges, and most sprays are not licensed). Honey is fine from one year and onward and genuinely helps soothe.
When It Stops Being Manageable at Home
Most children with viral tonsillitis turn the corner around days 4 to 5. Bacterial tonsillitis treated with antibiotics usually starts improving within 24 to 48 hours of the first dose. So the rough rule for a GP visit is: not better, or worse, by day 3 or 4.
Faster reasons to get them seen:
- Fever above 38°C still going on day 4 or beyond.
- Drinking has stopped — fewer than half their usual fluids, dry nappies, very dark urine, no tears.
- They are increasingly miserable rather than gradually settling.
- They are scratching at one ear and the throat hurts on that side (referred pain — possible ear infection or quinsy on the way).
Same-day or A&E reasons:
- Drooling because swallowing saliva is too painful.
- Voice sounds muffled, like a hot potato in the mouth.
- Cannot open the mouth fully (trismus).
- Stridor — a high-pitched noise on breathing in.
- Severe one-sided throat pain with a bulging tonsil and uvula pushed across — peritonsillar abscess (quinsy).
- Any difficulty breathing, listless or unrousable, severe headache with a stiff neck, or a non-blanching rash.
What About Recurrent Tonsillitis?
If a child is having tonsillitis often enough to keep the household in antibiotics or off school, that is its own conversation. The threshold for considering tonsillectomy is 7 disabling episodes in a year, 5 a year for two years, or 3 a year for three years — and most children below that line outgrow the pattern by their late primary years as the tonsils naturally shrink. Talk to the GP about referral if you are heading toward those numbers.
A Realistic Timeline
For a typical viral case: feverish day 1–2, throat at its worst day 2–3, gradual improvement from day 4, back at school by day 5–6.
For a treated bacterial case: starts improving by day 2 of antibiotics, fever gone by day 3, throat tender for another few days, full course finished even when they feel fine.
If the trajectory is going the other way — pain getting worse not better past day 3, or new alarm features appearing — that is the moment to get them assessed rather than wait for the weekend.
Key Takeaways
Most tonsillitis in children is viral and clears in 5 to 7 days without antibiotics. About a third of cases are caused by Group A streptococcus, which is the only cause that benefits from a 10-day course of penicillin. The picture that points to bacteria: no cough, pus on the tonsils, swollen tender glands at the front of the neck, and a high fever. The picture that points to a virus: a cold-like cough or runny nose, mouth ulcers, conjunctivitis. The two practical rules: keep them drinking, and get same-day review if they cannot swallow saliva, drool, or struggle to breathe.
