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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:
There are 4 basic causes of nasal congestion. 02/11/2011 in article. STRUCTURAL CAUSES. Included in this category are deformities of the nasal septum, the thin cartilage and bone that divide the nose into its two sides. These deformities can be congenital or can be due to an injury at some point in the patientâs life, including during birth.