The Met Office is predicting thunderstorms that could trigger a "pollen bomb" this weekend.
Rain is forecast from Saturday up until Tuesday next week with weekend pollen counts set to be "very high" across most of England.
Britain's 30 million hay fever sufferers have been urged to take extra precautions as their allergies will be "dramatically effected".
Airborne allergens expert Max Wiseberg said although many people associate rain and thunderstorms with a reduction in pollen count, this doesn’t always happen, the Sun reports.
"Thunderstorms can actually have the opposite effect – to make your hay fever far worse. This reaction to the weather is known as ‘thunder fever'," he explained.
Humidity can break pollen grains into smaller particles – making it worse for hayfever sufferers.
Max added that these smaller grains can even become "super pollen" which is more allergenic than normal pollen – causing more severe allergic reactions.
He said: "Storms cause great movements in the air, both bringing pollen grains down which might have otherwise risen above head height out of harm’s way, and whipping up pollen grains and fungal spores near the ground.
"To make matters worse, farmers will often work hard to get their fields harvested before a storm which further increases the level of allergens in the air.
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"And don’t think that living in the city will spare you from this either; the thunderstorm can pick all this pollen up and carry it for miles before dumping it at head height in the city.”
The expert suggested using a hay fever first aid kit consisting of one or more natural products such as a natural allergy balm like HayMax.
He added: "One antihistamine such as Piriteze, one nasal spray such as Beconase and eye drops such as Optrex.
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"The interesting thing about this is that many of these remedies can be complementary to each other.
"So if one helps, but doesn’t do the whole job, you may be able to try other remedies at the same time and get a better result.
"But there are rules: never take two anti-histamines together, never take 2 steroid nasal sprays together, and consult your pharmacist or doctor if you are already taking any other medication.”
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