Topic Overview

What is croup?

Croup is a common respiratory problem in young children. It tends to occur in the fall and winter. Its main symptom is a harsh, barking cough. Croup causes swelling and narrowing in the voice box, windpipe, and breathing tubes that lead to the lungs. This can make it hard for your child to breathe.

An attack of croup can be scary, but it is rarely serious. Children usually get better in several days with rest and care at home.

What causes croup?

Croup usually occurs a few days after the start of a cold and is usually caused by the same viruses that cause the common cold. Croup is contagious. The germs that cause it can be passed from one person to another through coughing and sneezing and through close contact. Regular hand-washing and limiting contact with others can help prevent the spread of croup.

As children grow older and their lungs and windpipes mature, they are less likely to get croup. Getting a flu vaccine each year may help your child fight off some of the viruses that can lead to croup.

What are the symptoms?

Symptoms of croup are caused by narrowed airways. They may include:

  • A barking cough. The cough is often compared to the sound of a barking seal. You'll know it when you hear it.
  • A raspy, hoarse voice.
  • A harsh, crowing noise when breathing in. Sometimes children breathe fast and need to sit up to breathe better.

Symptoms of croup often improve during the day and get worse at night. Sometimes children have croup attacks that wake them up in the middle of the night for a couple of nights in a row. Unless the illness is severe, a child with croup is usually alert and active. The child's temperature is usually normal or only slightly higher than normal.

The illness usually improves in 2 to 5 days.

How is croup diagnosed?

Your doctor will probably be able to tell whether your child has croup based on your child's symptoms and a physical examination. The doctor may be able to identify the barking cough of croup over the phone.

The doctor may place a small clip called a pulse oximeter on your child's finger, toe, or earlobe to make sure that enough oxygen is reaching the blood.

How is it treated?

Even though your child's coughing and troubled breathing can be frightening, home treatment usually eases the symptoms.

  • Try to stay calm during an attack, and soothe your child. Your child's crying can make the swelling in the windpipe worse and make it even harder to breathe.
  • Try running a hot shower to create steam. Do NOT put your child in the hot shower. Let the bathroom fill with steam. Have your child breathe in the moist air for 10 to 15 minutes.
  • Breathing cool night air also seems to help sometimes. Dress your child in warm clothes, and go outside for 10 minutes.
  • If symptoms improve with these methods, put your child back in bed. If the symptoms happen during the middle of the night, it is a good idea to sleep in or near your child's room until morning.
  • Be sure to keep your child well hydrated. Offer water, flavoured ice pops (such as Popsicles), or crushed-ice drinks several times each hour.
  • Do not let anyone smoke around your child or in the house.
  • Do not give your child over-the-counter cough or cold medicines. They don't help with croup, and they may not be safe for young children.

If your child's symptoms don't get better after 30 minutes, call your child's doctor. Because attacks often occur in the middle of the night when your doctor is probably not available, you may have to go to the emergency room.

If your child has severe difficulty breathing, call 911 or other emergency services immediately.

When home treatment isn't enough, medicines such as glucocorticoids or epinephrine may be used to decrease airway swelling. These are usually given in a doctor's office or an emergency room. In rare cases, your child may need to stay in the hospital to get extra oxygen or other treatment.

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Other Places To Get Help


Canadian Paediatric Society
Canadian Paediatric Society: Caring for Kids


Other Works Consulted

  • Bjornson C, Johnson DW (2014). Respiratory disorders: Croup. In J Gray, ed., Therapeutic Choices. Ottawa: Canadian Pharmacists Association. Accessed July 28, 2014.
  • Cherry JD (2009). Croup (laryngitis, laryngotracheitis, spasmodic croup, laryngotracheobronchitis, bacterial tracheitis, and laryngotracheobronchopneumonitis). In RD Feigin et al., eds., Feigin and Cherry's Textbook of Pediatric Infectious Diseases, 6th ed., vol. 1, pp. 254–268. Philadelphia: Saunders Elsevier.
  • Federico MJ, et al. (2011). Respiratory tract and mediastinum. In WW Hay et al., eds., Current Diagnosis and Treatment: Pediatrics, 20th ed., pp. 487–535. New York: McGraw-Hill.
  • Johnson DW (2014). Croup. BMJ Clinical Evidence. Accessed October 2, 2014.


ByHealthwise Staff
Primary Medical ReviewerJohn Pope, MD - Pediatrics
Anne C. Poinier, MD - Internal Medicine
Specialist Medical ReviewerThomas Emmett Francoeur, MD, MDCM, CSPQ, FRCPC - Pediatrics

Current as ofSeptember 9, 2014