What Causes Chronic Sinusitis? Center

Chronic sinusitis occurs when the tissue lining the facial sinuses becomes inflamed for at least three months. Chronic sinusitis usually involves nasal airway swelling (rhinitis). The causes of chronic sinusitis include nasal polyps, deviated nasal septum, medical conditions, respiratory tract infections, and allergies. Read more: What Causes Chronic Sinusitis? Article

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