Viral croup is the most common. Other possible causes include bacteria, allergies, and inhaled irritants. Acid reflux from the stomach can trigger croup. Viral croup is usually caused by human parainfluenza virus, but RSV, measles, adenovirus, and influenza can all cause croup as well.
What causes croup?
Viral croup is the most common. Other possible causes include bacteria, allergies, and inhaled irritants. Acid reflux from the stomach can trigger croup. Viral croup is usually caused by human parainfluenza virus, but {{ORGANIZATION}}, measles, adenovirus, and influenza can all cause croup as well.