AllergiesAn allergy is when your body’s immune system reacts to normally harmless substances that it sees as harmful. The allergy-causing substances are called allergens.
Your body’s immune system is a natural defence against infection and other foreign material. If you are allergic to something, your immune system will react every time you come into contact with that allergen.
Causes of allergies
Many substances can cause an allergic reaction, but some of the most common are:
pollen, mould, animal hair, dust and dust mites
latex, medicines, insect stings, foods.
Kinds of allergic reaction
Different allergens will cause different kinds of allergic reactions. The most common allergic conditions are hay fever, asthma and skin problems (eg, eczema, rashes, hives).
Airborne allergens such as mould, dust, pollen, grasses and weeds can cause hay fever.
Pollens, moulds and house dust can trigger asthma attacks.
Skin reactions can be caused by contact with an allergen (like latex or certain metals), by insect bites or stings, or by eating food or taking medicine you are allergic to.

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