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Post-nasal drip occurs when the body produces extra mucus, which accumulates in the throat and causes discomfort. Mucus is important because it keeps the nasal lining clean and fights off infections, but too much of it can cause post-nasal drip. This is a common symptom associated with colds, allergies, and sinus infections. People typically swallow mucus without noticing, but the feeling of mucus dripping down the throat can be unpleasant and irritating.

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1. Causes of Post-Nasal Drip

Many conditions cause post-nasal drip, such as allergies or a deviated septum. A smaller nasal passage can make it more difficult for mucus to drain properly, while sinus and viral infections may also prompt the issue. Airborne irritants like dust and smoke can generate thick mucus buildup, too. Some people experience post-nasal drip after encountering cold, dry air, but the condition is usually temporary. The regular drip of mucus creates an uncomfortable feeling in the throat, regardless of the cause.

runny nose Terri Rosa Fox / Getty Images
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