New research proves hay fever misery now lasts longer

If your hay fever feels worse than it used to, there is now scientific evidence to explain why. A major report published in April 2026 has confirmed what many sufferers have suspected for years: the pollen season is getting longer, and climate change is the cause.

What the new hay fever research found

The 2026 Europe Report of the Lancet Countdown on Climate Change and Health, produced by 65 researchers from 46 institutions, including University College London, looked at three trees common to Europe (birch, alder and olive) and found that climate change has prolonged the pollen season by one to two weeks compared to the 1990s. That means a longer window of daily symptoms, more missed days, and greater demand on medication that many people have been taking for months already.

The picture closer to home is just as stark. England now experiences around 20 more pollen-producing days per year than 30 years ago, with warmer springs increasingly bringing earlier and more intense birch tree pollen seasons. In cities like London, air pollution adds another layer, with diesel particulates known to intensify the body’s reaction to pollen, making urban symptoms worse than in rural areas.

Managing hay fever symptoms through a longer season

With symptoms now potentially running from February through to September, managing hay fever effectively matters more than ever. Some practical steps that can help:

• Check the daily pollen forecast and plan outdoor activity around lower-count days
• Start antihistamines before your symptoms typically begin, not after they arrive
• Use a saline nasal rinse to clear pollen from the nasal passages after time outdoors
• Keep windows closed during peak pollen hours, typically mid-morning and early evening
• Shower and change clothes after being outside on high-pollen days

These measures can reduce exposure, but for many patients, they are not enough on their own. If over-the-counter antihistamines are no longer controlling your symptoms, or if you find yourself suffering for more months of the year than not, it is worth seeking specialist help.

How The Harley Street ENT Clinic can help

Hay fever is not always straightforward. Symptoms can overlap with other conditions such as chronic sinusitis or nasal polyps, and without a proper diagnosis, many patients spend years treating the wrong problem. A specialist assessment establishes exactly what you are reacting to and why.

At The Harley Street ENT Clinic, we offer comprehensive allergy testing and a full range of treatments under one roof.

Depending on your assessment, options may include steroid nasal medication or immunotherapy, the latter a treatment course that gradually desensitises the immune system to specific pollen allergens and can reduce symptoms significantly over time.
Where antihistamines and nasal sprays are no longer enough, Dr Veeresh Patil, our Consultant Allergist, offers specialist allergy assessment and an in-house oral desensitisation programme for more severe or persistent cases.

If structural nasal problems are contributing, such as a deviated septum or polyps, we can address these too. You will not need multiple referrals or separate appointments elsewhere.

As the pollen season gets longer, the case for proper treatment only gets stronger. Call The Harley Street ENT Clinic on 020 7224 2350 to find out more about our allergy and sinus services and to book a consultation.