Perennial rhinitis is characterised primarily by nasal symptoms including watering or congestion of the nose and sneezing. It occurs due to an exaggerated response to an environmental trigger which results in inflammation of the lining of the nose. It is similar to hayfever, however the substances which cause the allergic reaction are present all year round. Common causes include the faecal matter of the house dust-mite, animal proteins from domestic pets, and industrial dusts and fumes.
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