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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.
This article discusses the possible causes and treatments of chronic cough in adults. Coughing that began less than eight weeks ago is discussed separately. (See Patient information: Acute bronchitis in adults (Beyond the Basics) .) More detailed information about chronic cough is available by subscription.