<unk>  is characterized by a "barking" cough, stridor, hoarseness, and difficult breathing which usually worsens at night. The "barking" cough is often described as resembling the call of a sea lion. The stridor is worsened by agitation or crying, and if it can be heard at rest, it may indicate critical narrowing of the airways. As<unk>  worsens, stridor may decrease considerably. Other symptoms include fever, coryza (symptoms typical of the common cold), and indrawing of the chest wall–known as Hoover's sign. Drooling or a very sick appearance can indicate other medical conditions, such as epiglottitis or tracheitis.
Croup
Foreign body
Bronchorrhea
Epiglottitis
Tonsillitis
Tracheitis
Laryngitis
Post-nasal drip