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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.
Save. Chronic cough is a condition caused by postnasal drip from your sinuses, excess mucus that trickles down the back of your throat and causes irritation. Relief from sinus cough can be achieved by treating your sinus infection--the source of your excessive coughing.