Definition

An allergen is a substance that can cause an allergic reaction.  In some people, the immune system thinks allergens are foreign or dangerous. This is what leads to allergy symptoms.

Information

Common allergens include:

  • Animal proteins and animal dander
  • Bacteria and viruses
  • Chemicals
  • Dust
  • Drugs (such as antibiotics or medications you put on your skin)
  • Foods (such as milk, chocolate, strawberries, wheat)
  • Perfumes
  • Plants
  • Pollen
  • Smoke

Related:Allergic rhinitis – what to ask your doctor – adult, Allergic rhinitis – what to ask your doctor – child

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