Croup mnemonic: most common in children <3 years of age.
3 S‘s:
StrIdor (a high-pitched sound heard on Inhalation)
Steeple sign (Subglottic Swelling) [look at the frontal X-ray of the C-spine]
Seal-like-bark cough (harsh “barking” cough and sneeze)
Most common cause is Parainfluenza virus.
