This article is from the Children Allergies and Asthma FAQ, by Eileen Kupstas Soo kupstas@cs.unc.edu with numerous contributions by others.
The most common inhaled allergen is dust! More precisely, dust mites
and their wastes (every house has them, no matter how clean).
Other:
- mold
- pollen (ie. hayfever)
- animal dander (especially cats)
- chemicals
- perfumes
Most common symptoms:
- CLEAR runny nose and sneezing
- itchy or stuffed nose
- itchy, runny eyes
- lethargy
- asthma
Symptoms are generally worst in the early morning, for 2 reasons:
1. pollen counts are highest
2. you've been sleeping for hours in a room filled with dust
and/or mold
 
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