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Post-nasal drip is a symptom of a nose disorder like a deviated septum or infection. Post-nasal drip occurs when the mucus secretions, which normally flow unnoticed, increase or become excessively thick. Thin secretions may be related to a deviated septum, allergies, infection, hormonal changes, and cold air, among other conditions. Thick secretions may be related to infection, dry air, or (usually in children) a foreign object in the nose. When the cause of the post-nasal drip is resolved the symptom should dissipate.Helpful? 1 person found this helpful.