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A runny nose occurs when the tissues or blood vessels in your nasal cavity produce excess mucous. This excess mucous is the result of the body trying to remove viruses, irritants, and allergens.

Runny nose can be caused by a cold, influenza, allergies (to dust, pollen, pet dander, etc.), or as a response to tobacco smoke or spicy foods.

A runny nose usually clears up on its own, but you should see a doctor for any of the following scenarios:
- if the runny nose does not improve in 3 to 4 days
- fever
- shortness of breath or trouble swallowing
- colored mucous (green, brown, black, etc.)
- bleeding, bruising, or rashes A runny nose occurs when the tissues or blood vessels in your nasal cavity produce excess mucous. This excess mucous is the result of the body trying to remove viruses, irritants, and allergens.

Runny nose can be caused by a cold, influenza, allergies (to dust, pollen, pet dander, etc.), or as a response to tobacco smoke or spicy foods.

A runny nose usually clears up on its own, but you should see a doctor for any of the following scenarios:
- if the runny nose does not improve in 3 to 4 days
- fever
- shortness of breath or trouble swallowing
- colored mucous (green, brown, black, etc.)
- bleeding, bruising, or rashes