Could that barking cough be croup?

If your little one suddenly sounds like a tiny seal barking, don’t panic — it might be croup, a common childhood illness that can sound much scarier than it is.

Croup (technically called laryngotracheobronchitis) causes swelling in the upper airway, which leads to the signature barking cough. It mostly affects children under 5 and usually shows up during cold and flu season. And while the sound can be alarming, most cases are mild and treatable at home.

“Croup can sound intense, especially in the middle of the night when symptoms tend to get worse,” says Jonathan Spahr, MD, a pediatric pulmonologist at Geisinger. “But with some steam, comfort and care, most kids bounce back quickly.”

What does a croup cough sound like?

Parents often describe the croup cough as a barking cough, similar to a seal or a dog. It's harsh, dry and can be accompanied by a high-pitched whistling sound when your child breathes in (called stridor). The cough tends to be worse at night and may come on suddenly.

Other symptoms of croup may include:

• Hoarse voice
• Noisy or labored breathing
• Low-grade fever
• Runny nose or cold-like symptoms

“Stridor can be concerning,” says Dr. Spahr. “If your child is struggling to breathe, or their lips or face turn blue, seek emergency care right away.”

What causes croup?

Croup is usually caused by a virus — most often parainfluenza, but other viruses like RSV or COVID can also trigger it. Like many respiratory illnesses, it spreads through coughing, sneezing or touching contaminated surfaces.

That means, yes — croup is contagious, especially in the early days of illness.

How long is croup contagious?

Kids with croup are most contagious during the first few days of symptoms or as long as they have a fever. Once the fever subsides and symptoms start improving, the risk of spreading it goes down.

“Keep your child home until they’ve been fever-free for 24 hours without medication,” advises Dr. Spahr. “Good handwashing is also key to preventing the spread.”

How is croup treated?

Most cases of croup are mild and can be managed at home. Here’s how to help your child feel better:

• Use steam: Sit with your child in a steamy bathroom for 10 – 15 minutes. The moist air can help ease their breathing.
• Stay calm: Crying or panic can make symptoms worse. Try to comfort and soothe your child.
• Use a cool mist humidifier: Especially at night, this can help moisten the air and reduce coughing.
• Encourage fluids: Water, popsicles and warm soup can soothe the throat and keep your child hydrated. Some pharmacies carry cough drops in lollipop form for kids, which can help moisten the throat, if your child is old enough.
• Ask your pediatrician: In some cases, a steroid like dexamethasone may be prescribed to reduce airway inflammation.

“If your child has a hard time breathing, is drooling or seems unusually drowsy, those are signs to seek care,” says Dr. Spahr. “It’s always better to be safe.”

When to see a doctor

Call your pediatrician if:

• Your child is under 3 months old and has a cough
• The cough or stridor is severe or worsening
• Your child has trouble breathing, swallowing or speaking
• Fever lasts more than 3 days

Most children recover from croup within 3 – 5 days, though a croupy cough can linger for up to a week.

The bottom line

If your child has a sudden barking cough, there’s a good chance it’s croup. While the sound can be startling, most cases are mild and short-lived. With the right care — and a little steam — you’ll have your happy, healthy kid back in no time.

See also:  

Concerned about your child’s cough? Geisinger pediatricians are here to help. Find care near you at geisinger.org/pediatrics.
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