Post-nasal drip Post-nasal drip Post-nasal drip (PND, also termed upper airway cough syndrome, UACS, or post nasal drip syndrome, PNDS) occurs when excessive mucus is produced by the nasal mucosa. The excess mucus accumulates in the back of the nose and eventually the throat once it drips down the back of the throat. It is caused by rhinitis, sinusitis, gastroesophageal reflux disease (GERD), or by a disorder of swallowing (such as an esophageal motility disorder). But also further sources such as an allergy, cold or flu and as a result of medications. However, researchers argue that the flow of mucus down the
Nasal consonant vowels, resulting in and . What would be coda nasal occlusives in other West Iberian languages is only slightly pronounced before dental consonants. Outside this environment the nasality is spread over the vowel or become a nasal diphthong ("mambembe" , outside the final, only in Brazil, and "mantém" in all Portuguese dialects). The Japanese syllabary kana ん, typically romanized as "n" and occasionally "m", can manifest as one of several different nasal consonants depending on what consonant follows it; this allophone, colloquially written in IPA as , is known as the moraic nasal, per the language's moraic structure. Welsh has