what causes nasal passage swelling?
Swollen nose passages. There are numerous causes of swollen nasal passages. Exposure to irritants such as dust, pet hair, and pollen is a common cause. Certain diseases such as sinusitis (inflammation of sinuses) and common cold are also known to cause. It could also be caused by bacterial or viral infection of the sinuses. Nasal passages that are swollen typically results when the delicate lining of the nose passages become inflamed.
1 Some of these nasal sprays include oxymetazoline, phenylephrine, and naphazoline.  Other causes of swollen nasal passages: Other possible causes of swollen nasal passages include environmental irritants, chemical exposure, food allergies or sensitivities, enlarged adenoids, or non-cancerous tumors.