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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.
An often-overlooked cause of the chronic cough is gastroesophageal reflux (GERD). GERD occurs when acid from the stomach travels up the esophagus. This abnormal condition can cause irritation of the esophagus and larynx resulting in the reflex production of a cough.