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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.
Leading Cause: Bronchitis. Bacterial bronchitis was the main cause of kids' chronic cough, the study shows. The researchers found asthma, GERD, or upper airway cough syndrome -- the most common causes of adults' chronic cough -- in less than 10% of the kids.