If you have noticed your hay fever starting earlier and lasting longer in recent years, you are not imagining it. Allergy specialists across Britain have been tracking a consistent trend: the spring pollen season is beginning earlier, lasting longer, and producing higher pollen counts than at any point in the past 30 years.
Research published by the University of Worcester and supported by data from the National Pollen and Aerobiology Research Unit has found that pollen seasons in major British cities have extended by approximately two to three weeks since the 1980s. The concentration of pollen in the air has also increased, meaning allergy sufferers are exposed to more pollen for a longer period each year.
Why the Season Is Getting Longer
The primary driver is warmer temperatures arriving earlier in the spring. Trees — particularly birch, oak, and ash, which are the most significant allergens for British hay fever sufferers — rely on temperature cues to begin their pollination cycle. As milder winters give way to earlier springs, these trees begin releasing pollen weeks ahead of historical averages.
Climate data from the Met Office supports this picture clearly: average spring temperatures in England have risen measurably over the past four decades, with the most significant warming occurring in the period from January to March. Urban heat island effects mean that London and other major cities experience this shift more acutely than rural areas.
What Doctors Recommend
Start treatment before symptoms appear. The most consistently effective approach to managing hay fever is to begin antihistamine treatment before the pollen season starts — ideally two weeks before your symptoms typically begin. Speak with your GP or pharmacist about appropriate options; non-drowsy antihistamines are available over the counter for most adults.
Use nasal corticosteroid sprays consistently. For moderate to severe hay fever, nasal sprays — available on prescription or over the counter — are often more effective than antihistamines alone. They work best when used regularly throughout the season rather than on an as-needed basis.
Monitor the pollen forecast. The Met Office publishes daily pollen forecasts during the season. On high-count days, limit time outdoors, particularly in the early morning when pollen levels are highest. Keep windows closed during peak pollen hours and shower after spending time outside.
Consider immunotherapy for long-term relief. For those with severe symptoms that are not adequately managed by medication, allergen immunotherapy — available through NHS referral to an allergy clinic — can desensitise the immune system to specific allergens over time. Results typically take two to three years to fully develop but can provide significant long-term improvement.
When to See Your GP
If hay fever is significantly affecting your quality of life, interfering with sleep, or not responding well to over-the-counter antihistamines, it is worth seeing your GP. An NHS referral to an allergy specialist can identify specific allergen sensitivities and develop a targeted treatment plan. Adults with asthma should be particularly vigilant during high-pollen periods, as hay fever can worsen asthma symptoms significantly.
With pollen seasons expected to continue lengthening as temperatures rise, addressing hay fever proactively rather than waiting until symptoms take hold each spring is increasingly worthwhile for the approximately 16 million Britons who suffer from the condition.