Allergies occur when your body overreacts to a harmless substance called an allergen. A runny nose, along with other nasal symptoms such as stuffiness or sneezing, is typically caused by allergic rhinitiscommonly called hay fever. Allergies often worsen during certain seasons or with changes in the weather. Learn more about how allergies cause a runny nose and how to treat it in this article.
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How Allergies Cause a Runny Nose
A runny nose can be caused by exposure to any allergen, including foods you might be allergic to. However, the most common allergy-related causes of runny nose are allergic rhinitis and sinusitis.
Allergic rhinitis causes a runny nose, stuffiness, sneezing, and itchy skin/eyes/mouth. Although this condition is commonly called hay fever, it doesn't usually cause a fever. It occurs when your body overreacts to harmless substances in your environment.
You might have "seasonal allergies" that cause your symptoms to worsen during ...