The arrival of spring is a joy for most of us, but for 15 to 20 per cent of Britons, hay fever can cast a dark cloud over the season. Hay fever is an allergy caused when the body makes antibodies to fight environmental triggers, such as pollen. Trees, grass and plants start to release their pollen in April, and the symptoms can last until October for some people. Children and teenagers are most commonly affected by the allergy.
90% of people in Britain with hay fever are allergic to grass pollen
50% Chance of inheriting an allergy if your parents have allergies
7 The age at which hay fever usually develops
Source: NHS Choices
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