LYCOS RETRIEVER 
Sinusitis: Infections
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Sinusitis is one of the most common diseases in the United States, affecting an estimated 15% of the population. The incidence of sinusitis has increased dramatically with the increasing incidence of asthma, allergies, and other upper respiratory tract infections. Each year, an estimated 50 million people in the United States have sinusitis, but the incidence of clinical frontal sinusitis specifically is lower.
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Sinusitis is an inflammation or infection of one or more of the sinuses. A sinus is a hollow air space in the skull. These are ... known as the para-nasal sinuses since they surround the nasal cavity. The para-nasal sinuses include:
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Sinusitis means your sinuses are infected or inflamed. Your sinuses are hollow air spaces within the bones surrounding the nose. They produce mucus, which drains into the nose. If your nose is swollen, this can block the sinuses and cause pain and infection.
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Sinusitis can affect any age horse. Older horses are more likely to have sinusitis from tooth root infections. Young horses are more likely to have a sinus cyst or a primary infection. It is rare, but both young and old horses may ... have a tumor in the sinus.
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Sinusitis can be caused by fungal, viral, or bacterial infections, as well as allergies. It can ... occur as a result of a tooth infection, or from frequent air travel or deep diving, both of which cause changes in atmospheric pressure; from nasal polyps, which interfere with proper drainage; and from nasal defects. All of these causes irritate the mucous membranes in the sinus cavities, causing inflammation, poor drainage, and infection.
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Sinusitis can ... be caused by a variety of factors, such as virus, fungal infections, and medication side-effects. Inhalation of airborne allergens such as dust, mold, and pollen, often set off allergic reactions.
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