What is an allergy?

Our immune system is designed to protect the body against foreign substances. But sometimes this system overreacts by detecting harmless substances as threatening.

A person without allergies would have no reaction to this substance. But an allergic person reacts to the usually harmless substance and their body produces antibodies to attack it. This sets off a complex chain reaction which causes the release of chemicals in your body including histamines. It is this chemical which causes the typical symptoms of an allergy, such as sneezing, itchy eyes or a runny nose.

For example, in hayfever, the immune system overreacts to pollen, and the release of histamine causes symptoms like sneezing, runny nose, itchy nose and watery eyes.

Be prepared

Whatever your allergy, be prepared with Piri...

Arm yourself with advice, support and services, whether it's knowing where your nearest outlet is to purchase products or having a look at the Understanding Allergies section on our website to know what your triggers are.

Take effective products at the first sign of symptoms and consult your GP if your symptoms do not improve after the duration stated within the product information leaflet.'s all about being prepared and being ready so that you can act before you react.


See information on the types of allergies that can affect you


See which symptoms we can help alleviate


What's triggering your symptoms? Find out here


Find the right treatment for your symptoms

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