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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:
Nasal polyps grow in inflamed tissue of the nasal mucosa. The mucosa is a very wet layer that helps protect the inside of your nose and sinuses and humidifies the air you breathe. During an infection or allergy-induced irritation, the nasal mucosa becomes swollen and red, and it may produce fluid that drips out.olyps can grow large enough to block your nasal passages, resulting in chronic congestion. Symptoms can include: 1  a sensation that your nose is blocked. 2  runny nose. 3  postnasal drip, which is when excess mucus runs down the back of your throat. 4  nasal stuffiness. 5  nasal congestion.