What symptom is a classic sign of an asthma attack?

Wheezing is a classic sign of an asthma attack due to the underlying pathophysiology of the condition. Asthma is characterized by inflammation and narrowing of the airways, which leads to difficulty in airflow during expiration. This narrowing results in a high-pitched whistling sound when a person breathes out, known as wheezing. It is an auditory manifestation of the constricted airways and serves as a key indicator that asthma is not well-controlled or that an acute exacerbation is occurring.

Other symptoms, such as chest tightness, shortness of breath, and cough, may also be present during an asthma attack; however, wheezing is typically more distinctive and easy to identify both by patients and healthcare providers. It is important to recognize this symptom as part of asthma management to prompt timely intervention and treatment.