What is a common respiratory symptom associated with asthma?

Narrowed airways are a hallmark symptom of asthma, which is characterized by inflammation and constriction of the bronchial tubes. This narrowing leads to difficulty in breathing, triggering symptoms such as wheezing, coughing, shortness of breath, and chest tightness. Asthma is a chronic condition where exposure to allergens or irritants can cause these airways to become inflamed and react, further constricting airflow.

The other symptoms listed are not directly associated with asthma. A rapid pulse can occur in response to various conditions, particularly those indicating stress or hypoxia, but it is not a defining symptom of asthma. Swollen limbs are more suggestive of circulatory or allergic reactions rather than respiratory issues. A rash on the skin is associated with many different conditions, including allergic reactions or infections, but it does not indicate the respiratory symptoms that are characteristic of asthma. Thus, narrowed airways is the most relevant and specific symptom linked to asthma.