That barking, seal-like cough. Usually mild and steroid-responsive, but noisy breathing at rest is a 999 call.
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Croup is a viral infection that swells the voice box and windpipe in young children, narrowing the airway just below the vocal cords. It produces a cough that parents recognise instantly once they have heard it — harsh, barking, seal-like — and often a hoarse voice and noisy breathing.
It typically affects children between six months and three years, peaks in autumn and winter, and is nearly always caused by ordinary respiratory viruses.
Two things make croup less frightening than it sounds. The first is that it is usually mild and self-limiting, settling over three to five days. The second is that a single dose of an oral steroid works remarkably well — it reduces the swelling within hours and is one of the most effective single-dose treatments in children's medicine.
The distinction that matters is whether the noisy breathing happens only when the child is upset and active, or whether it is there at rest.
Mild: barking cough, no stridor at rest, child playing and drinking normally.
Moderate: stridor at rest, some pulling in of the chest or the skin above the collarbone, but the child is still alert and interactive.
Severe — 999: stridor at rest with marked chest recession, agitation or unusual sleepiness, pale or blue colour, or a child too breathless to speak or drink.
A quiet chest in a child who has been noisy is not improvement. It can mean the child is tiring, and it is a reason to act quickly rather than relax.
Croup is not caused by cold air, going out without a coat, or anything a parent did. It is a virus meeting a small airway.
Croup is a clinical diagnosis and the cough is close to diagnostic. A barking, seal-like cough with a hoarse voice in a child of this age, following a day or two of cold symptoms, does not usually need any test.
No blood tests, no swabs and no X-rays are needed in typical croup. Investigating a straightforward case distresses the child and adds nothing.
Severity, not the diagnosis. The clinician is looking at whether stridor is present at rest, how hard the child is working to breathe, their colour, alertness and hydration.
Almost never for croup itself. A neck X-ray is occasionally used where the diagnosis is genuinely uncertain, but it is not part of routine assessment.
Croup assesses better on video than most childhood illnesses, because the two things that matter most — the sound of the cough and the child's breathing effort — are both visible and audible on a call.
Stridor at rest, marked chest recession, drooling, an inability to swallow, a child sitting forward to breathe, or any blue or grey colour.
If a child is struggling to breathe, do not book anything — call 999.
Call 999 immediately if your child:
Do not try to look inside the throat of a drooling, distressed child. It can worsen the obstruction. Keep them calm and upright and wait for the ambulance.
Seek same-day assessment if: your child has stridor only when upset, is not drinking, has a fever that will not come down, or you are simply worried and want them assessed. Parental instinct is a reasonable reason.
Keep the child calm. Crying and distress make the airway narrower and the noise worse, so a settled child breathes more easily. Sit them upright on your lap, stay calm yourself, and avoid anything that upsets them — including trying to look in their throat.
Steam and hot showers. This is long-standing advice with no good evidence behind it, and it carries a real scald risk in a distressed child. It is worth abandoning.
Cold night air is often described as helping. Trials have not shown a benefit, though there is no harm in it if it calms everyone — which may be the actual mechanism.
Cough medicines and decongestants are not recommended for young children.
Keep them home while feverish or unwell, and they can return once they are back to themselves. There is no fixed exclusion period.
For a child with croup, NHS 111 and your own GP are the appropriate first calls, and out of hours they are the only sensible ones. We are open 6am to 10pm and croup is at its worst overnight.
This page follows NICE Clinical Knowledge Summaries on croup, and the NICE guideline on fever in under 5s (NG143) for assessing an unwell child.
NICE NG143 sets out the traffic-light system for identifying serious illness in children under five, based on colour, activity, respiratory effort, hydration and other features. Parental concern is explicitly part of that assessment.
Reviewed against NICE CKS and NG143 current at the date shown above.
The cough is the giveaway — harsh and barking, like a seal. Parents who have heard it once recognise it immediately.
Add a hoarse voice, a day or two of cold symptoms first, and symptoms worse at night, and it is very likely croup.
Noisy breathing while the child is calm and at rest. Noise only when upset is far less concerning than noise while sleeping.
Also: sucking in under the ribs, blue or grey colour, drooling, or unusual drowsiness. Any of those is 999.
Yes, considerably — and it is recommended even for mild croup. A single oral dose reduces airway swelling within hours and shortens the illness.
One dose is usually all that is needed.
No. It is traditional advice with no evidence behind it, and hot water carries a genuine scald risk with a distressed child.
Keeping them calm and upright does more.
Airway swelling and the body's natural steroid rhythm both work against you overnight. The second night is often the worst.
Expecting that helps — it is the pattern of the illness rather than a deterioration.
No. Croup is viral, and antibiotics do nothing for it.
They are reserved for the rare bacterial complications, in a child who is becoming rapidly more unwell.
The viruses that cause it are, yes. Other children who catch them may simply get a cold rather than croup.
Normal hand hygiene, and keep them home while unwell.
Some children get croup with most viral illnesses for a couple of years, then grow out of it as the airway grows.
Recurrent croup is worth a conversation, particularly if it is very frequent or the child is older than usual.
Yes, for fever or discomfort, at the correct dose for weight. Unlike in chickenpox, there is no specific reason to avoid it in croup.
Fluids matter more than either painkiller.
August 30, 2026
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It means the diagnosis can usually be made from your history and photographs, and that treatment can be arranged safely without examining you. Where a condition is not marked treatable online, it is because examination is the diagnosis — listening to a chest, feeling an abdomen, examining an ear or a joint — or because a procedure or device is needed.
Yes, where there is a genuine bacterial infection — cellulitis, impetigo, bacterial urine infections, confirmed strep throat. We will also frequently tell you that you do not need one. Most sore throats, coughs, colds and earaches are viral, and an antibiotic gives you the side effects with none of the benefit.
If your problem turns out to be genuinely outside what we can do remotely, the doctor will tell you straight away, point you to the right service, and refund your fee in full. We would rather do that than fill twenty minutes to justify the charge.
Call 999 or go to A&E — do not book an online appointment and do not wait for a reply to an email. For urgent problems that are not emergencies, NHS 111 is available 24 hours a day, online or by phone, and can direct you to the right service.
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