Post-nasal drip (PND), also known as upper airway cough syndrome (UACS), 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.
Associated conditions 
PND is known to be a cause of halitosis, especially when a sinus infection is also present. Acid reflux or heartburn is believed to aggravate and in some cases cause post-nasal drip.
Individuals may be diagnosed as suffering from post-nasal drip if they suffer from the following symptoms:
First and foremost, as the causes are manifold, a removal of those causes should be targeted. Treatment may include antibiotics, decongestants, nasal irrigation, sinus massage, acid control medication, allergy medication, and minor surgery. Bulb syringes, squirt bottles, pulsatile nasal irrigators or neti pots are often used for nasal irrigation. Allergy medications include antihistamines, decongestants, nasal steroids alone or in combination. Allergy injections may be used for long-term relief when allergy is the cause. Oral steroids may be prescribed for short-term use in some situations.
- ^ Rosenberg, M (1996). "Clinical assessment of bad breath: current concepts". Journal of the American Dental Association 127 (4): 475–82. PMID 8655868.
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