Rhinorrhea (runny nose) is mucus dripping or “running” out of your nose. It has several possible causes, such as cold and/or dry air, allergies or viral infections.

Rhinorrhea is characterized by an excess amount of mucus production in response to parasympathetic stimulation and inflammatory cytokines [3] by mucous membranes that line the nasal cavities. The …

Jan 7, 2026 · Runny noses, or rhinorrhea, can be caused by a variety of factors, including colds, allergies, and even stress. Understanding these causes can help identify the best treatment options …

Apr 7, 2023 · A runny nose is often called rhinorrhea or rhinitis. But the terms are different. Rhinorrhea involves a thin, mostly clear fluid running from the nose. Rhinitis involves irritation and swelling inside …

Nasal Congestion and Rhinorrhea - Etiology, pathophysiology, symptoms, signs, diagnosis & prognosis from the Merck Manuals - Medical Professional Version.

Feb 19, 2026 · Rhinorrhea is nasal drainage that occurs when the lining inside the nose becomes inflamed. The discharge may be clear, yellow, or tinged with blood, and it often happens along with …

Rhinorrhea, or a runny nose, happens when excess fluid drains from the nose. The fluid is mucus that is thin or thick, clear or opaque, and can be intermittent or constant.