What is allergy?

Allergy is a reaction or an immune response to substances that are not harmful for most other people.

What causes allergy?

People who are allergic react to one or more substances exposure. Substances that can cause allergic reactions are

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  • Pollen
  • Dust mites
  • Mold spores
  • Pet dander
  • Food
  • Insect stings
  • Medicines
  • These substances are called allergens.


Allergens can enter the body through food, air, eyes, skin, etc. Allergens which enter through nose cause itching, stuffiness in nose and throat, mucus production, cough and sneezing. The allergens which enter through eyes may cause itching, redness and swelling in the eyes. If the allergens pass into the body through food then they may cause nausea, vomiting, diarrhea, pain etc. When allergy is on the skin, the allergen might have touched the skin surface leading to skin rash, itching, peeling off etc.

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