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Post-nasal drip ( PND , also termed upper airway cough syndrome , UACS , or post nasal drip syndrome , PNDS ) occurs when excessive mucus is produced by the nasal mucosa . The excess mucus accumulates in the throat or back of the nose . It is caused by rhinitis , sinusitis , gastroesophageal reflux disease (GERD), or by a disorder of swallowing (such as an esophageal motility disorder ). It is frequently caused by an allergy , which may be seasonal or persistent throughout the year. [ medical citation needed ]