People with hay fever should check if they suffer reactions to any fruits, vegetables or nuts, experts warned yesterday.
As many as 40 per cent of sufferers also have reactions to some foods, according to research by Allergy UK.
During the pollen seasons, when symptoms are worse, sufferers may be unwittingly aggravating their problems, the organisation says.
It found that 24 per cent of sufferers did not realise they could also suffer reactions to some foods. The food may cause what is known as oral allergy syndrome – with swelling and itchiness around the mouth and lips.
This week has been declared as National Allergy Week – and the organisation says that food is now the second most common substance to cause allergic reactions, after pollen.
Its top five allergies list also includes the house dust mite, pets and medication.
Lindsey McManus, of Allergy UK, said: "15 years ago oral allergy syndrome was considered unusual but now it is increasingly commonplace. The condition is caused by the proteins in some fruit, nuts, vegetables and spices triggering a cross-reaction in someone with hay fever.
"When they eat a food that shares similar proteins as the pollen, it can cause an allergic reaction, such as, an itchy mouth, swelling or tingling of lips and tongue."
In Zurich, Switzerland, the European Academy of Allergy and Clinical Immunology said hay fever sufferers should start taking medication as soon as the spring begins. It says the most severe symptoms often occur at the beginning of the pollen season.
And it warned that many sufferers may also unwittingly suffer from asthma.
A spokesman said: "Your doctor can recommend the best strategy to avoid a stuffy nose, the endless sneezing and the itchy eyes. Current medications are safe and effective, and they will help you to carry on with your daily life.
"This will be especially important for students who are approaching their final exams!"
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