Alternative names
Allergen; Irritant

Definition
An allergen is a substance that can cause an allergic reaction. Allergens are substances that, in some people, the immune system recognizes as “foreign” or “dangerous” but cause no response for most people.

Information

Common allergens include:

 
• chemicals and plants  
• drugs (such as antibiotics, serums)  
• foods (such as milk, chocolate, strawberries, wheat)  
• infectious bacteria, viruses, and animal parasites  
• inhalants (such as dust, pollen, perfumes, smoke)  
• physical agents (such as heat, light, friction, radiation)

See also:

 
• allergies  
• allergic reaction  
• food allergy  
• allergy to drugs  
• antibody

Medical Encyclopedia

All ArmMed Media material is provided for information only and is neither advice nor a substitute for proper medical care. Consult a qualified healthcare professional who understands your particular history for individual concerns.