What symptom is commonly associated with an asthma attack?

High-pitched wheezing is a hallmark symptom of an asthma attack, linked to the narrowing of the airways due to inflammation, bronchoconstriction, or increased mucus production. This wheezing sound occurs when air flows through these constricted pathways, resulting in a characteristic high-pitched noise that can be heard during breathing, particularly when exhaling. This symptom indicates the difficulty the person is experiencing in getting air out of the lungs, making it a key indicator of an asthma exacerbation.

The other symptoms listed, while they may occur for various reasons, do not specifically characterize an asthma attack. Blurred vision, severe headaches, and nausea are not typical presentations in this context and are more associated with different medical conditions or responses. Thus, high-pitched wheezing stands out as the most relevant and specific symptom indicating an asthma attack.