What is a key indicator that someone may have a complete blockage of their airway?

The presence of choking is a significant indicator that someone may have a complete blockage of their airway. When an individual begins to choke, it typically means that an object, food, or some other obstruction has lodged in the throat, making it difficult or impossible for air to pass through. During this state, the person may not be able to cough effectively; coughing would be the body's natural response to expel the obstruction. If they are unable to make any sounds or breathe, this is often an indication of a severe or complete airway blockage.

Other scenarios, such as the person breathing normally, the caller becoming unresponsive, or the individual coughing loudly, do not similarly indicate a complete blockage. Normal breathing suggests the airway is clear. If the caller becomes unresponsive, it could imply other medical issues, but it does not specifically isolate the condition of airway obstruction. Loud coughing indicates that the person has some air flow and is likely not experiencing a complete blockage but rather a partial obstruction. Thus, choking serves as the clearest warning sign that immediate attention and possible intervention are required.