The characteristic signs of viral croup are:
- The infection often starts with a common cold or pharyngitis.
- A mild fever
- A typical ‘barking’ cough
- Inspiratory stridor is often, but not always, present. It is usually worse at night and then much better in the morning.
- Hoarseness of the voice is a less common sign in viral croup.
Viral croup typically presents at night with inspiratory stridor and a barking cough.
Stridor can also be cause by an inhaled foreign body, retropharyngeal abscess, epiglottitis or, rarely, by diphtheria.