What is a less common cause of chronic cough?

Chronic cough can have various underlying causes, and while lung cancer is a recognized cause, it is less common compared to other causes like asthma or upper airway cough syndrome. Asthma, for instance, is a frequent etiology in patients presenting with a chronic cough, particularly in younger populations. Upper airway cough syndrome often stems from post-nasal drip, which is also a prevalent contributor. Allergic rhinitis commonly leads to chronic cough due to inflammation and mucus production in the airways.

Lung cancer, while serious and certainly a potential cause of chronic cough, usually arises in older individuals or those with significant risk factors. It tends to be less prevalent than conditions like asthma or UACS among the general population. Therefore, it is more accurate to categorize lung cancer as a less common cause of chronic cough relative to the other options presented. This underscores the importance of considering a full range of more prevalent causes when diagnosing chronic cough in patients.