Croup

Also called Laryngotracheobronchitis

Croup is a common infection in young children, usually caused by a virus, that makes the windpipe and voice box swell. It causes a distinctive barking cough, a hoarse voice and a harsh sound when breathing in (stridor). It is usually mild and gets better within 48 hours, but it can sometimes make breathing difficult.

Last updated Nov 9, 2026

What it is

It mostly affects children between 6 months and 3 years and is often worse at night.

Keeping the child calm and upright helps. A single dose of steroid medicine from a doctor reduces the swelling. Severe croup needs hospital care.

Common signs

  • A barking cough, like a seal
  • A hoarse voice
  • A harsh, rasping sound when breathing in
  • Fever and runny nose

How it is usually diagnosed

  • Recognised from the cough and examination

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Notes of episodes and treatment, especially if it recurs
  • Hospital discharge summaries

Questions to ask your doctor

  • Does my child need steroid medicine?
  • How can I tell if the breathing is getting worse?
  • Why does it keep coming back?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Struggling to breathe, the skin sucking in under the ribs, blue or grey lips, drooling or being unable to swallow, or unusually quiet and drowsy: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources