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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.
Some common causes of chronic cough include asthma, allergic rhinitis, sinus problems (for example sinus infection),esophageal reflux of stomach contents, medications such as ACE inhibitors, and whooping cough.