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For adults, the most common causes of chronic cough are asthma, gastroesophageal reflux disease (GERD), and upper airway cough syndrome (related to postnasal drip), according to background information in Marchant's study.
The most common causes for chronic cough in a nonsmoker with a normal CXR are postnasal drip syndrome, asthma, and gastroesophageal reflux disease (GERD). Medications called ACE inhibitors are another major cause of chronic cough. Common causes for chronic cough in smokers are bronchitis and lung cancer.