LYCOS RETRIEVER 
Rhinitis: People
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The cause of vasomotor rhinitis is not well understood. In a sufficiently high concentration, many odors will cause nasal irritation in almost anyone. Some people are unusually sensitive to irritation and will have significant nasal symptoms even when exposed to low concentrations of irritants. Thus, vasomotor rhinitis seems to be an exaggeration of the normal nasal response to irritation, occurring at levels of exposure that don't bother most people. It occurs more often in smokers and older individuals.
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Atrophic rhinitis occurs when the mucous membranes of the nasal passages thin (atrophy) and harden, causing the passages to widen and dry out and become more vulnerable to infection. The nasal bone can ... become weakened and is more likely to break. The disorder affects older people worldwide but is growing less common in developing countries. Atrophic rhinitis may result from aging itself or from chronic infection, sinus surgery, radiation therapy, or unusual diseases, such as sarcoidosis.
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You probably know that pollens from trees, grasses, and weeds cause allergic rhinitis. Many people have allergies to dust mites, animal dander, cockroaches, and mold as well. Things in the workplace, such as cereal grain, wood dust, chemicals, or lab animals, can ... cause allergic rhinitis.
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Allergic rhinitis ... influences other diseases. Uncontrolled hay fever symptoms can lead to sinus infections, ear infections and worsening of asthma. And people with allergic rhinitis are more prone to illnesses, since the inflammation in the nose makes them more susceptible to the virus that causes the common cold.
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More and more people are developing allergic rhinitis because pets and central heating in winter encourage the growth of house dust mites. As a consequence, many people have symptoms all year round, while others have winter seasonal symptoms. As with asthma and eczema, it can run in atopic families.
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Viral infection is a major cause of asthma, so viral rhinitis may be a prelude to asthma attacks in susceptible patients (mainly people who already have a history of asthma). Asthma can ... develop following viral rhinitis. Finally, some patients suffering primarily from asthma also have concomitant rhinosinusitis.
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