Viral<unk>  is usually a self-limiting disease, with half of cases resolving in a day and 80% of cases in two days. It can very rarely result in death from respiratory failure and/or cardiac arrest. Symptoms usually improve within two days, but may last for up to seven days. Other uncommon complications include bacterial tracheitis, pneumonia, and pulmonary edema.
Croup
Foreign body
Bronchorrhea
Epiglottitis
Tonsillitis
Tracheitis
Laryngitis
Post-nasal drip