The human body is replete with a host of defense mechanisms that protect from microorganisms, the environment, insects, etc. The most vulnerable target on the human body is the airway. Airway is the term used to describe the circuit that brings air from the environment and into the lungs. There are numerous reflexes, structures, and protective measures designed to keep the airway from becoming obstructed.. but sometimes they fail. The causes of foreign body airway obstruction:

• foreign body airway obstruction
• tongue blocks airway in unconscious patient
• blood or secretions
• swelling
• trauma to the neck