Postnasal Drip: Allergy or Sinusitis? How to Tell the Difference

Postnasal drip is a common symptom seen in both allergic rhinitis and sinusitis, and it does not indicate a diagnosis on its own. Key differences lie in mucus characteristics, accompanying symptoms, and the course of the condition.
Symptoms such as itching, sneezing, and clear discharge are more suggestive of allergy, while thick mucus, facial pain, and a general feeling of illness are more consistent with sinusitis. A definitive diagnosis is usually made through ENT examination and, when necessary, endoscopic evaluation.