Which of the following is a symptom of airsickness?

Nausea is commonly recognized as a primary symptom of airsickness. When individuals experience airsickness, it occurs due to a conflict between the visual input and the signals received from the inner ear, which helps with balance. This conflict can lead to feelings of turbulence and discomfort in the stomach, resulting in nausea.

While dizziness, headache, and fatigue can also be associated with various forms of discomfort or motion sickness, they are not as specifically indicative of airsickness as nausea is. Nausea directly correlates with the body's reaction to the motions experienced during flight. In a flight scenario, managing nausea effectively is crucial for the comfort and safety of passengers, making this a significant symptom for flight attendants to monitor and address.