Definition of Runny nose

Runny nose: The production of extra mucus by the nose. Rhinorrhea is the medical term for this common problem. The nose makes extra mucus whenever something that is in the nose, such as pollen or dust, needs to be removed. Mucus formation is also part of the histamine reaction to allergies and of the body's defenses during respiratory infections.

SLIDESHOW

A Cold or The Flu? How to Tell the Difference See Slideshow

Health Solutions From Our Sponsors