Table of Contents Introduction What is an allergy? What Causes Allergies? What is an allergic reaction? Symptoms of Allergies to Airborne Substances Pollen Allergy Mold Allergy Dust Mite Allergy Animal Allergy Chemical Sensitivity Diagnosing Allergic Diseases Treating People with Allergic Diseases Allergy Research Keeping On Top of Your Health Condition Information Resource

What is an allergy?

An allergy is a specific immunologic reaction to a normally harmless substance, one that does not bother most people. People who have allergies often are sensitive to more than one substance. Types of allergens that cause allergic reactions include pollens, dust particles, mold spores, food, latex rubber, insect venom, or medicines.