Aetiology
Seasonal rhinitis is most commonly an allergic reaction to pollen, usually grasses and trees.
Perennial allergic rhinitis is most commonly a reaction to:
- dust
- mites found in mattresses, carpets, furry toys
- feathers
- animal dander—most commonly cats and dogs
- occupational allergic rhinitis is caused by allergens found at work, e.g., people working with latex gloves, bakers (flour dust), wood dust (1)
However, note that:
- many patients are allergic to both seasonal and perennial allergens, and may have perennial symptoms without seasonal exacerbations
- a succession of seasonal allergens may mask seasonality
Reference:
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