5 doctors weighed in:

What causes croup?

5 doctors weighed in
Dr. Melissa Arca
Pediatrics
2 doctors agree

In brief: It's a virus.

Croup is caused by a virus.
Most commonly, the parainfluenza virus. This virus infects the upper respiratory tract, more specifically, the larynx (voice box) and trachea (wind pipe). This is why children with croup end up with a hoarse voice and the telltale barking cough. Cases of croup peak in the fall and winter and are generally most common in children ages 3 months to 3 years.

In brief: It's a virus.

Croup is caused by a virus.
Most commonly, the parainfluenza virus. This virus infects the upper respiratory tract, more specifically, the larynx (voice box) and trachea (wind pipe). This is why children with croup end up with a hoarse voice and the telltale barking cough. Cases of croup peak in the fall and winter and are generally most common in children ages 3 months to 3 years.
Dr. Melissa Arca
Dr. Melissa Arca
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Dr. Scott Katz
Pediatrics
1 doctor agrees

In brief: Viral Infection

Croup describes an inflammation of the windpipe, that can be caused by many different viruses.
Typical symptoms include a barky cough and noisy breathing (stridor). Treatment consists of cool mist or steam, and sometimes oral steroids or breathing treatments.

In brief: Viral Infection

Croup describes an inflammation of the windpipe, that can be caused by many different viruses.
Typical symptoms include a barky cough and noisy breathing (stridor). Treatment consists of cool mist or steam, and sometimes oral steroids or breathing treatments.
Dr. Scott Katz
Dr. Scott Katz
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Dr. Gerald Mandell
Nuclear Medicine

In brief: Can cause croup

Most cases of croup are caused by viruses, usually parainfluenza virus and sometimes adenovirus or respiratory syncytial virus (RSV).

In brief: Can cause croup

Most cases of croup are caused by viruses, usually parainfluenza virus and sometimes adenovirus or respiratory syncytial virus (RSV).
Dr. Gerald Mandell
Dr. Gerald Mandell
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