Which is one of the main causes of an airway obstruction?

An airway obstruction occurs when something blocks the airway, preventing airflow to the lungs. One of the main causes of airway obstruction is the tongue, especially in unconscious or semi-conscious individuals. When someone is in a supine position (lying on their back), the tongue can fall back into the throat, effectively blocking the airway and making it difficult for the person to breathe.

In the context of emergencies and first aid, recognizing that the tongue can obstruct the airway is crucial; it often requires maneuvering techniques, such as the head-tilt chin-lift or jaw-thrust maneuver, to open the airway and restore breathing. Understanding this mechanism helps first responders act quickly and effectively when someone is having difficulty breathing. The other options, while they can contribute to airway issues, are not as common or immediate a concern as the presence of the tongue in the airway.