A runny nose is a condition that causes excessive amounts of mucous or fluid to run out of a person's nose or down his throat. A constant runny nose may be a symptom of a serious illness or a simple annoyance.
According to Mayo Clinic, sinusitis, the common cold or influenza may cause a runny nose. Chickenpox, whooping cough and other infectious diseases can also cause a patient to develop a runny nose.
A constant runny nose can be a sign of an allergic reaction to pollen, dust or other airborne allergens.
Tobacco smoke, air pollution and other airborne irritants can lead to the development of a continuous runny nose.
You may have a runny nose when eating unusually spicy foods. Stress, drug addiction and cold temperatures can increase the likelihood of developing a constant runny nose.
When to See a Doctor
You should see a doctor if a runny nose lasts longer than 10 days, if it is accompanied by a high fever, or if nasal discharge is green, warns Mayo Clinic. A bloody nasal discharge and a persistent clear discharge are also cause to see a doctor
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