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Colds usually trigger this process, but any factor that causes the mucous membrane to become inflamed may lead to sinusitis. Many people with nasal allergies (allergic rhinitis), for instance, are likely to have recurring or long-term (chronic) sinus infections. Nasal polyps, foreign objects (usually in children), structural problems in the nose such as a deviated septum, and other conditions can also block the nasal passages, increasing the risk of sinusitis.
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