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The most common causes of chronic nasal congestion are allergic rhinitis, from environmental allergens or irritants, and chronic rhinosinusitis. Chronic rhinosinusitis is defined as a sinus infection of greater than 12 weeks' duration that includes 2 or more major sinus symptoms or at least 1 major and 2 minor symptoms. Major symptoms include:
Dilated blood vessels can cause nasal congestion (stuffy nose). Guaifenesin and pseudoephedrine is a combination medicine used to treat stuffy nose, sinus congestion, and cough caused by allergies or the common cold. Guaifenesin and pseudoephedrine may also be used for purposes not listed in this medication guide.