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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.
Conditions within the chest known to cause chronic cough include cancer, unusual growth of a lymph node, and an abnormal enlargement of the aorta, the main blood vessel leaving the heart. An often-overlooked cause of the chronic cough is gastroesophageal reflux (GERD). GERD occurs when acid from the stomach travels up the esophagus.