What Are The Causes of Chronic Sinusitis
In chronic sinusitis, the membranes of both the paranasal sinuses and the nose are thickened because they are constantly inflamed. Most experts now use the term “chronic rhinosinusitis” to describe this condition, and they also recommend that the condition be divided into rhinosinusitis with or without nasal polyps. Nasal polyps are grape-like growths of the sinus membranes that protrude into the sinuses or into the nasal passages. Polyps make it even more difficult for the sinuses to drain and for air to pass through the nose.
The causes of chronic sinusitis are largely unknown. The condition often occurs in people with asthma, the majority of whom have allergies. It is possible that constant exposure to inhaled allergens that are present year-round, such as house dust mites, pets, mold (a kind of fungus), and cockroaches cause chronic inflammation of the nose and the sinuses.
An allergic reaction to certain fungi may be responsible for at least some cases of chronic sinusitis; this condition is called “allergic fungal sinusitis.” At least half of all people with chronic rhinosinusitis do not have allergies, however.
Most health experts believe that chronic rhinosinusitis is not an infectious disease (like acute sinusitis). If you suffer frequent episodes of acute sinusitis, however, you may be prone to develop chronic rhinosinusitis. Other causes of chronic rhinosinusitis may be an immune deficiency disorder (for example, primary immune deficiency disease or HIV infection) or an abnormality in the quality of mucus produced by the respiratory system (cystic fibrosis).
Another group of people who may develop chronic sinusitis are those with significant anatomic (structure) variations inside the nose, such as a deviated septum, that lead to blockage of mucus.


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