how are people allergic to stuff? :)

Question: how are people allergic to stuff? :)
- Keywords:
  allergic,
  allergy
Asked by shaniah to Judith on 22 Jun 2011.
- Judith McCann answered on 22 Jun 2011:
  
  Allergies are caused by our own immune systems. The immune systems there to stop nasty bacteria and things infecting our bodies but allergies happen when they get sensitive to things that aren’t harmful eg. dust, fur, pollen (hayfever), peanuts. Our immune systems fire up and try to get rid by making you sneeze, your eyes water or even vomiting!
  
  I have recently developed hayfever-not fun!

shaniah commented on 28 Jun 2011:

bet you have fun with that :L

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Question: how are people allergic to stuff? :)