This document outlines the common causes of chronic cough, which include upper airway disorders such as upper airway cough syndrome and chronic sinusitis, lower airway and parenchymal disorders such as asthma, chronic bronchitis and bronchiectasis, as well as other causes such as gastroesophageal reflux and ACE inhibitors.

1. Common etiologies of chronic cough
Upper airway
disorders
• Upper airway cough syndrome
(postnasal drip)
• Chronic sinusitis
Lower airway
&
parenchymal
disorders
• Asthma
• Post-respiratory tract infection
• Chronic bronchitis
• Bronchiectasis
• Lung cancer
• Nonasthmatic eosinophilic bronchitis
Other causes
• Gastroesophageal reflux
• ACE inhibitors