Post-nasal drip

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What Wikipedia says

Post-nasal drip (PND), also known as upper airway cough syndrome (UACS) or idiopathically as catarrh, occurs when excessive mucus is produced by the nasal mucosa. The excess mucus accumulates in the back of the nose, and eventually in the throat once it drips down the back of the throat.

Excerpt from the Wikipedia article “Post-nasal drip”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mahdy Fouad derivative work: Jeffamaname, CC BY-SA 4.0, via Wikimedia Commons.