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Chronic sinusitis is often described as being with or without nasal polyps. Polyps are tissue swellings that occur in the lining of the sinuses and the nose, resulting in a grape-like growth. These polyps will often block the drainage pathways of the sinuses, as well as cause difficulty with nasal breathing and the ability to smell. Chronic sinusitis can be caused by a viral infection, allergies, dental infections, or changes in the anatomy that limit the drainage of your sinuses.