Other allergies.
Some people have allergic reactions to other sources, including:
Aerosols
Air fresheners
Air pollution
Aspirin
Cat dander
Christmas trees
Drugs
Eggs
Garden plants
Insect stings
Iodine dye
Perfumes
Ragweed pollen
Tobacco
Wood smokeSome factors can make allergies feel worse, including:
Cold air
Humidity
Wind
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