Mold is a fungus with a big job in the natural world, breaking down dead plant matter. It spreads through tiny spores that can cause an allergic reaction. Only a few types of mold actually cause allergies.
How to Tell You're Allergic
The only way you can know for sure you have a mold allergy is to see an allergist. He will ask about your symptoms and what seems to trigger them. If he thinks you have a mold allergy, he'll probably do allergy testing to confirm it.