What is a characteristic sign of upper airway edema?

A characteristic sign of upper airway edema is a seal-like bark. This distinctive cough sound resembles that of a barking seal and is typically associated with conditions such as croup, which is often caused by viral infections leading to inflammation and swelling in the upper airway. This swelling can obstruct airflow, leading to the characteristic cough.

In conditions causing upper airway edema, the swelling predominantly affects the larynx, trachea, and surrounding structures. This results in not just the barking cough but may also accompany stridor, which is a high-pitched wheezing sound resulting from turbulent airflow in the narrowed airway.

Other symptoms can include difficulty breathing and hoarseness, but the seal-like bark is a defining feature that helps healthcare providers identify the condition quickly.