Health condition · Clinically reviewed
Hay fever, seasonal allergic rhinitis that actually responds to treatment.
A pollen-triggered nasal and eye allergy that affects around a quarter of UK adults. Most cases respond to a stepped medication approach — but the severe cases benefit from immunotherapy.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced from guidance
Checked against BSACI, NICE CKS and peer-reviewed sources you can see at the end.
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Current for 2026
Reflects UK guidance on stepped medication, combination sprays, and allergen immunotherapy for severe disease.
Key facts
Hay fever at a glance.
The essentials, in plain English — what it is, how common it is, when it hits, and what actually works.
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What it is
IgE-mediated allergic rhinitis — an immune reaction to inhaled pollen causing nasal, ocular and sometimes chest symptoms.
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How common
Around 1 in 4 UK adults are affected, and prevalence continues to rise year on year.
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The pollen calendar
Tree pollen dominates spring, grass pollen late May to July, and weed pollen through late summer into autumn.
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Peak weeks matter
Starting treatment two weeks before your usual peak is far more effective than reacting once symptoms hit.
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First-line treatment
Non-sedating antihistamines — loratadine, cetirizine or fexofenadine — control most mild-to-moderate cases.
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Immunotherapy
The only disease-modifying option — retrains the immune system over three years for lasting relief in severe disease.
Why this guide matters
Hay fever is more treatable than most think.
Timing, technique and — for the severe end — immunotherapy have transformed what good hay-fever care looks like. These three points shape the rest of the page.
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Timing beats dose
Starting two weeks before your usual peak controls symptoms far better than reacting to a flare.
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Sprays outperform tablets
Intranasal corticosteroids are the single most effective treatment — used correctly and used daily.
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Immunotherapy is disease-modifying
A three-year course of SLIT or SCIT retrains the immune system for lasting relief in severe cases.
How the diagnosis is made
From first symptoms to a clear plan.
The steps a UK GP or allergy clinic will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
History, pollen calendar and antihistamine trial
Phase 2 · Confirming
Allergy testing and ENT review where needed
Phase 3 · Managing
Immunotherapy and self-management plan
- 01
Recognising
Symptom + calendar history
When symptoms flare and where you were — grass, tree or weed pollen leave a distinctive seasonal fingerprint.
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Recognising
Pollen-count check
Cross-reference symptom days against the Met Office pollen forecast to confirm the trigger and season.
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Recognising
Trial antihistamine
A two-week trial of a non-sedating antihistamine both confirms the diagnosis and settles most mild cases.
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Confirming
Skin-prick or specific-IgE test
Where the trigger is uncertain, allergy testing pinpoints the specific pollen and guides immunotherapy.
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Confirming
ENT review for nasal polyps
Persistent blockage, reduced smell or one-sided symptoms warrant nasal endoscopy to exclude polyps.
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Managing
Immunotherapy consultation
Severe or exam-year sufferers who fail standard treatment benefit from a specialist immunotherapy assessment.
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Managing
Structured self-management plan
A written seasonal plan — start dates, step-ups, avoidance measures — reduces symptom days and rescue treatment.
Typical timeline: 2–6 weeks from first consultation to a settled seasonal plan.
Symptoms
What hay fever actually feels like.
Symptoms cluster around the nose and eyes but can spill into sleep, sinuses and asthma. Here is what to look for.
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Sneezing
Bouts of repeated sneezing, worst first thing in the morning and outdoors on high-pollen days.
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Itchy nose and palate
A characteristic itch inside the nose, roof of the mouth or throat that antihistamines settle quickly.
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Runny nose
Clear watery discharge — different from the thicker mucus of a cold or sinus infection.
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Itchy watery eyes
Red, gritty, watering eyes — often the most disabling symptom, especially for contact-lens wearers.
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Asthma flares
Pollen triggers underlying asthma in many sufferers — cough, wheeze and reliever use both climb in season.
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Sinus pressure
Facial pressure across the cheeks and forehead from congested nasal passages and blocked sinus drainage.
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Sleep disruption
Nasal blockage and post-nasal drip fragment sleep — a major reason for daytime fatigue and reduced performance.
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Sudden facial swelling
Sudden facial swelling or breathlessness is anaphylaxis, not hay fever — call 999 immediately.
Treatment
How hay fever is treated in the UK.
Antihistamines for mild cases, intranasal steroids for most, immunotherapy for severe disease — what each option does, and where it fits.
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Non-sedating antihistamine
Loratadine, cetirizine or fexofenadine — first-line, taken daily through your pollen season.
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Intranasal corticosteroid
Mometasone or fluticasone spray — the most effective single treatment for nasal symptoms when used correctly.
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Ocular antihistamine drops
Sodium cromoglicate or olopatadine drops — target itchy watery eyes that oral antihistamines don’t fully settle.
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Nasal saline rinse
Daily saline irrigation washes pollen off the nasal lining and improves spray penetration — cheap and effective.
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Combination azelastine/fluticasone
A dual antihistamine and steroid spray — faster and stronger than either agent alone for moderate-to-severe cases.
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Oral montelukast (specialist)
A leukotriene receptor antagonist — useful add-on where hay fever and asthma coexist and standard therapy fails.
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Allergen-specific immunotherapy
SLIT tablets or SCIT injections over three years — the only treatment that modifies the underlying allergy.
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Barrier creams and avoidance
Petroleum jelly at the nostrils, wraparound sunglasses, showering after being outdoors, and closed windows on high-count days.
What this guide is based on
The sources behind every claim on this page.
UK national guidance and specialist society standards, current at the time of last review.
Key references
Guidelines and standards we relied on.
A quiet reminder
This guide is for information, not medical advice.
Your GP or allergy specialist knows your history and can tell you which parts apply to you. If in doubt, ask for a review.
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British Society for Allergy and Clinical Immunology (BSACI). Rhinitis management guideline.
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NICE CKS. Allergic rhinitis — diagnosis and management.
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Allergy UK. Patient information and seasonal advice.
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Met Office. UK pollen forecast and calendar.
Red flags
When it isn’t just hay fever.
Most hay fever is well controlled with the right regimen. These are the situations where you should act, or seek specialist input.
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Facial swelling
Sudden swelling of lips, tongue or face suggests anaphylaxis — call 999 and use an adrenaline pen if prescribed.
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Sudden breathlessness
Acute breathlessness or throat tightness is not hay fever — treat as an emergency and call 999.
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Anaphylaxis history
Any previous anaphylaxis warrants specialist review, an adrenaline pen and a written emergency plan.
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Uncontrolled asthma with hay fever
Rising reliever use through pollen season means your asthma plan needs stepping up — do not wait for an attack.
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Nasal polyps with anosmia
Persistent blockage with loss of smell needs ENT assessment — polyps respond well to targeted treatment.
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Chronic sinusitis
Facial pain lasting more than 12 weeks warrants imaging and ENT input — different pathway from seasonal hay fever.
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Occupational exposure
Symptoms worse at work suggest occupational allergy — needs formal assessment and workplace measures.
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Pregnancy and severe symptoms
Not all antihistamines and sprays are suitable in pregnancy — check with your GP or midwife before starting.
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Chronic decongestant spray use
Regular use of xylometazoline or oxymetazoline for more than a week causes rebound congestion — needs a weaning plan.
Living with it
A seasonal condition, but a very manageable one.
Four things that make the biggest difference — timing, technique, avoidance measures and a proper end-of-season review.
A quiet reminder
Good control is normal — settle for nothing less.
If you still can’t sleep, still miss work, or still can’t enjoy the summer — treatment needs stepping up, not tolerating.
- 01 Timing
Start treatment two weeks early
Beginning your antihistamine and nasal spray before symptoms hit is far more effective than chasing a flare.
- 02 Technique
Nasal spray technique matters
Head slightly forward, spray outwards away from the septum, don’t sniff hard — most sprays are used wrong.
- 03 Avoidance
Small changes, real impact
Shower and change clothes after being outdoors, keep car and bedroom windows shut on high-count days.
- 04 Reviews
Season-end review
A short review at the end of pollen season lets you refine next year’s plan — timing, medication, immunotherapy.
Frequently asked
Everything we get asked about hay fever.
Quick answers on timing, antihistamines, nasal sprays, immunotherapy, asthma and when to worry.
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When should I start taking my hay-fever medication?
Around two weeks before your usual season starts — for grass-pollen sufferers, that means mid-May. Starting early prevents the allergic inflammation building up and gives far better control than reacting once symptoms hit.
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Which antihistamine is best?
Non-sedating antihistamines — loratadine, cetirizine or fexofenadine — are all first-line. Fexofenadine is the least sedating; cetirizine tends to be the strongest but slightly more sedating. Avoid older sedating antihistamines like chlorphenamine for daytime use.
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Are nasal steroid sprays safe long-term?
Yes — modern intranasal steroids like mometasone and fluticasone have minimal systemic absorption and are safe for daily use through the pollen season, and often year-round for perennial rhinitis.
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What is immunotherapy and who is it for?
Allergen-specific immunotherapy — sublingual tablets (SLIT) or injections (SCIT) — retrains the immune system to tolerate pollen. It runs over three years and is offered when standard treatment fails, symptoms are severe, or hay fever significantly affects work, school or exams.
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Can hay fever trigger my asthma?
Yes — pollen is a common asthma trigger, and around 80% of people with asthma have allergic rhinitis. Treating hay fever properly often improves asthma control, and vice versa.
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When should I seek urgent help?
Sudden facial swelling, difficulty breathing or throat tightness is anaphylaxis, not hay fever — call 999 immediately. Uncontrolled asthma symptoms through pollen season also warrant same-day review.