water vapor in breath condenses as the warm air meets the colder outside temperature near the nostrils. This causes excess water to build up inside nasal cavities, spilling out through the nostrils.

Inflammatory

Infection

Rhinorrhea can be a symptom of other diseases, such as the common cold or influenza. During these infections, the nasal mucous membranes produce excess mucus, filling the nasal cavities. This is to prevent infection from spreading

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