Croup in children is a common viral illness that inflames the voice box and windpipe, producing a distinctive barking cough and a harsh, noisy sound when the child breathes in. It is most often seen between six months and about three years of age and tends to be worse at night. Most cases are mild and settle at home, but because a small child’s airway is narrow, swelling can occasionally cause serious breathing difficulty. Knowing the difference between mild croup and an emergency is what matters.
Signs of Croup in Children
- A harsh “barking” or seal-like cough
- A hoarse voice or cry
- Stridor, a high-pitched or rasping noise when breathing in
- A runny nose and mild fever, usually for a day or two beforehand
- Symptoms that worsen at night and often ease by day
With mild croup in children, the child is happy to play, has stridor only when upset or coughing, and is not working hard to breathe.
Warning Signs That Need Urgent Help
Call the emergency number or go to an emergency department straight away if the child:
- Has stridor while resting or calm
- Is working hard to breathe, with the skin sucking in below the ribs or at the base of the throat, or the nostrils flaring
- Has blue or grey lips or skin
- Is very drowsy, limp, pale or unusually agitated
- Is drooling or cannot swallow
- Is under six months old, or has a known narrow airway
Drooling, a child who sits stiffly forward and an absent cough can point to the rarer but more dangerous condition described in our guide to epiglottitis. Do not try to look into the throat. If you suspect it, keep the child calm and upright and call for urgent help.
Home Care for Croup in Children
- Stay calm. Crying and distress make the airway noisier and the breathing harder. Cuddle the child upright on your lap.
- Offer fluids. Small, frequent sips keep the child comfortable. Do not force drinks if breathing is laboured.
- Treat fever or discomfort carefully. If you use a pain or fever medicine, follow the label for the child’s weight and age, or ask a pharmacist or doctor.
- Stay close through the night. Check the child’s breathing regularly, because symptoms often peak after midnight.
- Seek a medical review. Even mild croup is worth a doctor’s assessment, as a single dose of a steroid medicine often shortens symptoms.
What About Steam?
Running a hot shower to fill the bathroom with steam has long been recommended, and some older first aid manuals still describe it. Studies have not shown a clear benefit, and hot water and steam bring a real risk of scalds, particularly to a frightened and wriggling toddler. A calm cuddle, fluids and prompt medical advice are the safer choices.
How Doctors Treat Croup
Moderate and severe croup in children is usually treated with a corticosteroid taken by mouth, which reduces airway swelling within hours. Severe cases may also receive nebulised adrenaline and a period of observation in hospital. Antibiotics do not help, because croup is caused by a virus.
Croup in Children Compared With Choking and Asthma
Croup has a barking cough, fever and hoarseness and builds over a day or so. Choking starts suddenly, often with food or a small object, and needs the steps in our infant choking first aid guide. Asthma causes a wheeze on breathing out and is described in our guide to asthma in children.
Frequently Asked Questions
Is croup contagious?
The viruses that cause croup spread through coughs, sneezes and shared surfaces. Handwashing and keeping a sick child home help limit spread.
How long does croup last?
Most cases of croup in children improve within three to five days, although the cough may linger for a little longer.
Can croup come back?
Yes. Some children get croup more than once, usually with different viral colds.
References and Further Reading
Last updated: October 2026
Prepared by: EHS Guidelines Editorial Team
This article is general educational information and is not a substitute for accredited first aid training or professional medical care. In an emergency, call your local emergency number immediately. Emergency numbers, medicines and protocols differ between countries, so follow local guidance.
2 Trackbacks / Pingbacks