has participant quality postnasal drip AE 10036402 CTCAE: E13514 PDN NCIt: C78566 WEB: http://en.wikipedia.org/wiki/Post-nasal_drip Upper Airway Cough Syndrome SS, YH UACS a respiratory system AE which has an outcome of postnasal drip, which occurs when excessive mucus is produced by the nasal Mucosa. The excess mucus accumulates in the throat or back of the nose. respiratory system AE AE severity G1 AE severity G2