”Excessive dynamic airway collapse” results from the overt invagination of the posterior tracheo-bronchial wall during tidal expiration. Its clinical presentations are not easily distinguishable from other common obstructive airway disorders, while the therapeutic principles are distinct. Diagnosis requires appropriate imaging studies. Long term sequelae of the disorder include recurrent lower airway infection and even chronic respiratory failure. By reviewing the current relevant literature, this article attempts to acquaint the readers with such an airway disorder that has gained growing attention in recent years.