Post-nasal drip (PND), also termed upper airway cough syndrome (UACS), or post nasal drip syndrome (PNDS) occurs when excessive mucus produced by the nasal mucosa accumulates in the throat or back of the nose.
- Rhinitis, sinusitis, gastroesophageal reflux disease (GERD)
- Swallowing disorder:
- Oesophageal motility disorder
- Allergy (allergic postnasal drip)
- Cold or flu
- Medications and other cause