Which of the following is a common symptom of asthma?

Coughing, especially at night, is a common symptom of asthma due to the inflammation and constriction of the airways that occurs in this condition. Asthma typically manifests with bronchoconstriction, leading to difficulty in breathing and a persistent cough as a reflex response to irritation in the airways. This cough is often worse at night or early in the morning, making it a key indicator for healthcare providers.

In contrast, while chest pain, frequent headaches, and nausea can occur in various medical conditions or due to different triggers, they are not classic symptoms of asthma. Chest pain may arise from other respiratory issues or conditions affecting the chest wall, headaches could be related to stress or tension, and nausea can result from many gastrointestinal problems, none of which specifically point to asthma. Thus, coughing, particularly at night, stands out as a hallmark symptom of this respiratory condition.