Real allergies are almost always triggered by large protein molecules. Proteins that are known to have the capacity to cause allergies are called allergens. Substances in the environment known as allergens are triggers of an allergic reaction. Nearly anything can be an allergen for someone.

The most common causes are:

  • pollen from trees and grasses
  • proteins secreted from house dust mites
  • pets, such as cats and dogs, and other furry or hairy animals (guinea pigs, horses etc.)
  • insects like bees and wasps
  • molds / moulds
  • foods such as peanuts, milk, eggs, tree nuts…
  • medicines