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We can get a runny nose due to common cold, flu, allergies, sinus infection, etc. Now, our nose consists of a mucous membrane which secretes a slimy substance called mucus. However sometimes, this membrane produces excess mucus which comes out of our nostrils, thus causing a condition called rhinorrhea, popularly known as runny nose.
But why is our body producing mucus in the first place?
For protection. Mucus contains mucins which give mucus its gel-like properties helping it trap germs, dust, etc., and thus preventing them from entering our body. Mucus also contains antibodies and immune cells which kill germs and other foreign particles. Besides this, mucus even warms and moisturizes the inhaled air, thus preventing our breathing passage from getting damaged.
