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Croup
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lungs Breathing

Croup

Croup is an inflammation of the vocal cords and windpipe that typically causes a distinctive barking cough and breathing difficulties in young children.

Overview

Croup is an inflammation of the vocal cords (larynx) and windpipe (trachea). It is usually caused by a virus, such as the parainfluenza virus, though allergies and reflux can also be factors. Croup is most common in the fall and winter, particularly in children between the ages of 6 months and 3 years.

Symptoms

Croup often begins with cold-like symptoms before progressing to:

  • A barking cough
  • A hoarse voice
  • Difficulty breathing
  • Fever
  • High-pitched, noisy breathing sounds

Symptoms are generally worse at night and typically last for three to five days.

Treatment

Most cases of viral croup are mild and manageable at home. However, because croup can occasionally become serious and interfere with a child's ability to breathe, parents should contact a health care provider immediately if they are concerned about their child's breathing.

Frequently Asked Questions

Yes, a cool mist humidifier or a warm shower can help loosen mucus and soothe the airway. Keep the room well ventilated and avoid hot steam, which can irritate the airway.
Recurrent croup is uncommon but can occur, especially in children with allergies or reflux. Persistent or severe cases may require evaluation for underlying conditions such as asthma or laryngomalacia, but most children recover fully without lasting effects.
If your child has trouble breathing, a rapid breathing rate (more than 40 breaths per minute in a 2‑year‑old), a bluish tint to the lips or face, or if you notice a severe wheeze or stridor that does not improve with home measures, seek emergency care immediately.
Most viral croup resolves within 3 to 5 days. Symptoms often peak at night and gradually improve during the day. If symptoms persist beyond a week or worsen, contact your pediatrician.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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