Guide · 8 min
Your Hayfever Bucket Is Already Half Full Before Pollen Season Starts
How histamine from food, drink, and your body adds up — and what to do about it
In short
Fermented foods, aged cheeses, processed/dry-fermented meats, certain fish (especially spoiled), and fermented beverages (red wine, beer) are consistently identified as the highest dietary sources of histamine due to bacterial decarboxylation of histidine, with concentrations highly variable…
You didn't change. So why did today feel so much worse?
You took your antihistamine. The pollen count wasn't exceptional. You'd managed last Tuesday without much trouble. But today? Your eyes are streaming before you've left the house, your nose is running through lunch, and by mid-afternoon you feel like you've run a marathon through a rapeseed field.
If you've ever had a day like this — and most hayfever sufferers have — you've probably lived the histamine bucket theory without knowing it. It's one of the more intuitive ideas in allergy science, and while the evidence behind it is still developing, it offers a genuinely useful lens for understanding why your symptoms don't follow a tidy script.
The Science: A Bucket You're Always Filling
The histamine bucket model proposes something elegantly simple: your body has a capacity to break down histamine, and symptoms emerge not from any single source crossing a threshold, but from the total load of histamine overwhelming that capacity — like a bucket overflowing.
Histamine enters your system from three main directions. First, dietary sources: fermented foods, aged cheeses, cured meats, red wine, and beer all contain significant histamine produced when bacteria convert the amino acid histidine during fermentation, ageing, or spoilage. Concentrations vary wildly — up to 475 mg/kg in dry-cured sausages, 55 mg/L in red wine, and dangerously high levels in improperly stored fish (Maintz & Novak, 2007; Sánchez-Pérez et al., 2021). Second, histamine liberators — foods like strawberries and tomatoes that contain relatively little histamine themselves but trigger your mast cells to release it anyway, via non-IgE mechanisms. Third, and critically during pollen season, endogenous release: when airborne allergens bind IgE on your mast cells, they degranulate and flood local tissue with histamine.
Your body degrades histamine through two main enzymes. Diamine oxidase (DAO) handles histamine in the gut and bloodstream — it's your primary extracellular defence. Histamine N-methyltransferase (HNMT) works intracellularly. When either is impaired — by genetic variants in the AOC1 gene (which codes for DAO), by alcohol, by gut inflammation, or by dysbiosis — histamine clearance slows and unmetabolised histamine reaches H1, H2, and H4 receptors across multiple organ systems, producing the full symphony of symptoms: sneezing, congestion, itching, headaches, skin flushing, gut upset (Maintz & Novak, 2007; Duelo et al., 2024).
The research on DAO and hayfever severity is preliminary but suggestive. A study by Mayo-Yáñez et al. (2021) found that approximately 46% of patients with persistent allergic rhinitis showed DAO activity deficits, and those with deficient DAO had measurably lower nasal peak inspiratory flow (76.30 vs 93.62 L/min, p=0.010) and higher rates of nasal itching. A related study by Aghili & Rezaeian (2022) explored serum DAO as a potential biomarker in seasonal allergic rhinitis. These aren't definitive findings — the studies are small and observational — but the biological logic is coherent: if pollen is already triggering endogenous histamine release, a sluggish DAO has less headroom to cope with anything else you add to the bucket.
What This Means for You
Think of your histamine bucket as having a variable capacity. Genetic variants in AOC1 — present in a meaningful proportion of the population — may reduce your baseline DAO activity and shrink that capacity before the day even begins (Duelo et al., 2024). Gut inflammation, whether from a virus, a course of antibiotics, or chronic dysbiosis, can further reduce DAO production in the intestinal mucosa.
Now layer in a high-pollen day. Your mast cells are already primed and releasing histamine. Add a glass of red wine the evening before: alcohol and its metabolite acetaldehyde competitively inhibit DAO while simultaneously triggering mast cell degranulation — a double hit (Zimatkin & Anichtchik, 1999). A lunch including aged cheese and a tomato-based sauce adds dietary histamine and liberators simultaneously. By the time the afternoon pollen peak hits, your bucket isn't just full — it's been teetering since breakfast.
This also explains the unpredictability that makes hayfever so frustrating. On a low-dietary-histamine day with no alcohol and a mild pollen count, you might sail through. The same pollen count the next day, after a social evening, may flatten you. Your symptoms aren't inconsistent — your total load is.
Alcohol deserves a specific mention
Of all the modifiable contributors to histamine load, alcohol has some of the clearest mechanistic evidence. A 2025 analysis (He et al.) found that alcohol-induced upper airway symptoms are 3–8 times more prevalent in people who already have allergic rhinitis compared to the general population. Red wine is particularly problematic: its polyphenols can additionally activate basophils and drive upper airway inflammation beyond pure histamine mechanisms. Interestingly, Mendelian randomisation data suggests alcohol doesn't cause allergic rhinitis — it worsens it if you're already susceptible (He et al., 2025). That's a meaningful distinction: you're not imagining the effect, but it's about amplification, not initiation.
The Evidence Landscape: What We Know, and What We Don't
It's important to be honest here. The histamine bucket model is mechanistically plausible and clinically useful as a framework, but it remains largely a heuristic — a helpful way of thinking rather than a rigorously validated quantitative model.
No prospective randomised controlled trials have directly measured cumulative histamine flux from multiple simultaneous sources against objectively quantified symptom thresholds. The specific plasma histamine levels that reliably predict symptom onset differ between individuals, and we don't yet have a reliable way to measure your 'bucket level' in real time.
For low-histamine diets in hayfever specifically, the evidence gap is even more pronounced. Dietary restriction has shown promise in chronic urticaria and histamine intolerance populations — with small studies showing urticaria severity score reductions of 35–55% — but no RCTs have assessed a low-histamine diet against validated rhinitis symptom scores during a real pollen season (Joneja & Carmona-Silva, 2001; Duelo et al., 2024). The ongoing double-blind RCT by Duelo et al. (registered 2024) may begin to fill this gap, but results are not yet available.
For DAO-supporting supplements — vitamin B6, vitamin C, and copper, all of which have roles in DAO structure or function — the evidence is almost entirely mechanistic. An in vitro study suggests vitamin B6 status modulates DAO efficacy by around 20% (Seidl et al., 2024), and copper's role at the enzyme's catalytic centre is biochemically established. But no human RCTs have tested these micronutrients as isolated interventions with validated outcomes. One additional caution: combined high-dose vitamin C and copper supplementation produced oxidative renal injury in a mouse model, suggesting co-supplementation isn't risk-free and shouldn't be approached casually.
Exclusion diets, too, deserve scrutiny. A rigorous 2021 analysis by Sánchez-Pérez et al. found that only around 32% of foods commonly excluded on low-histamine diets are actually justified by objectively high histamine content — suggesting many people are restricting foods unnecessarily based on lists that outrun the evidence.
What Haelo Recommends
Given the evidence — its promise and its current limits — here's how to translate the histamine bucket concept into practical, proportionate action:
1. Track your total load, not just pollen On high-pollen days, your endogenous histamine production is already elevated. This is exactly when reducing other inputs to your bucket — dietary histamine, alcohol, sleep deprivation, and stress (which also drives mast cell activation) — is most likely to make a meaningful difference. Use Haelo's pollen forecast to plan your lowest-histamine dietary days around your highest-risk pollen days.
2. Prioritise alcohol reduction on high-pollen days The evidence here is more robust than for diet alone. Alcohol inhibits DAO, triggers mast cell release, and in red wine, activates additional inflammatory pathways. If you drink, the day before a high-pollen forecast is a poor choice. This is one of the most evidence-grounded adjustments you can make.
3. Be strategic, not restrictive, about diet Rather than following a blanket low-histamine exclusion list — which the evidence doesn't fully support — focus on the genuinely high-histamine sources: aged hard cheeses, dry-cured meats, red wine, beer, and fish that isn't fresh. These have the clearest quantitative justification (Sánchez-Pérez et al., 2021). You don't need to abandon tomatoes entirely.
4. Consider DAO testing if symptoms are consistently severe If your hayfever symptoms seem disproportionate to pollen counts, are triggered easily by food and alcohol, and respond poorly to standard antihistamines, it may be worth discussing DAO activity testing with your GP. This won't be standard practice everywhere, but it's a reasonable question if the bucket model resonates with your experience.
5. Approach DAO supplements with realistic expectations Oral DAO supplements (typically derived from porcine kidney) have shown some benefit in histamine intolerance populations and a randomised trial in migraine (Izquierdo-Casas et al., 2018). The evidence in allergic rhinitis is absent. They may be worth a cautious trial during pollen season if you have confirmed or suspected DAO deficiency, but treat them as supportive rather than curative, and source from reputable manufacturers.
6. Don't supplement copper and high-dose vitamin C together Until better human safety data exist, co-supplementation of these two nutrients at high doses is not advisable based on current evidence.
The histamine bucket won't be the whole story for everyone. For many hayfever sufferers, pollen load alone drives their season, and dietary tweaks will make little perceptible difference. But for those who notice wide symptom variability day to day — or whose symptoms seem outsized relative to the pollen count — the bucket framework offers a genuinely actionable way to reclaim some control. Knowing what fills your bucket is the first step to keeping it from overflowing.
The evidence
What the research actually says
Each answer below is drawn from a graded research review. Confidence reflects the strength of the underlying evidence, not how confident we feel about it.
What is the histamine bucket theory and how does total histamine load affect symptom thresholds?
The histamine bucket theory is a heuristic model proposing that symptoms of histamine intolerance emerge when cumulative histamine load from multiple sources—dietary intake, endogenous mast cell release, and gut bacterial production—exceeds an individual's enzymatic degradation capacity, analogous to a bucket overflowing. Evidence from observational studies and oral provocation trials supports that symptom onset is threshold-dependent rather than dose-linear, with approximately 80-90% of HIT patients showing reduced DAO activity (<40% of normal), and dietary restriction reducing symptoms in 50-75% of cases. However, the model remains largely heuristic, as no high-quality RCTs have directly tested cumulative multi-source histamine load against quantified symptom thresholds.
How it works
Diamine oxidase (DAO) is the primary enzyme degrading extracellular histamine in the gut mucosa, while HNMT handles intracellular methylation; when either is genetically impaired (e.g., AOC1 SNVs reducing DAO activity, HNMT Thr105Ile variants) or inhibited by factors such as alcohol, inflammation, or dysbiosis, unmetabolized histamine enters systemic circulation and triggers H1/H2/H4 receptor-mediated symptoms across multiple organ systems. Endogenous sources—including mast cell degranulation driven by allergens, estrogen, or stress—synergistically add to the total load, explaining why individual tolerance is highly context-dependent and variable day to day.
Confidence: low
Which common foods and drinks are high in histamine or trigger histamine release?
Fermented foods, aged cheeses, processed/dry-fermented meats, certain fish (especially spoiled), and fermented beverages (red wine, beer) are consistently identified as the highest dietary sources of histamine due to bacterial decarboxylation of histidine, with concentrations highly variable (e.g., up to 475 mg/kg in sausages, 55 mg/L in red wine, 264 mg/meal from spoiled fish). Additionally, certain foods termed 'histamine liberators'—including strawberries, tomatoes, and alcohol—trigger endogenous histamine release from mast cells via non-IgE mechanisms even though their inherent histamine content is low. Only approximately 32% of foods excluded in common low-histamine diets are justified by objectively high histamine content, suggesting current dietary exclusion lists may be broader than the quantitative evidence supports.
How it works
Histamine accumulates in foods primarily through microbial histidine decarboxylase activity during fermentation, aging, or spoilage, converting the amino acid histidine into histamine. Histamine liberators (e.g., strawberries, tomatoes) and alcohol trigger mast cell degranulation or inhibit degradative enzymes (DAO, HNMT), increasing systemic histamine load independent of direct dietary histamine content.
Confidence: moderate
Does diamine oxidase (DAO) deficiency increase hayfever severity?
DAO deficiency appears to be associated with increased allergic rhinitis severity, with approximately 46% of persistent AR patients showing DAO activity deficits, and DAO-deficient patients demonstrating significantly lower nasal peak inspiratory flow (76.30 vs. 93.62 L/min, p=0.010) and higher prevalence of nasal itching. However, the difference in DAO deficit prevalence between mild AR (33%) and moderate/severe AR (48%) did not reach statistical significance (p=0.376), and no causal relationship has been established.
How it works
DAO is the primary extracellular enzyme responsible for degrading histamine in the intestinal mucosa and bloodstream; when DAO activity is reduced, histamine clearance is impaired, allowing accumulation of both ingested and mast-cell-released histamine that binds H1 receptors on nasal mucosa, amplifying vasodilation, glandular secretion, and neuronal stimulation characteristic of allergic rhinitis.
Confidence: low
Can a low-histamine diet reduce hayfever symptoms during pollen season?
No high-quality clinical evidence from RCTs or systematic reviews supports a low-histamine diet as an effective intervention specifically for hayfever symptoms during pollen season. Available evidence for dietary histamine restriction is largely limited to chronic urticaria and histamine intolerance populations, where small, non-blinded studies show urticaria severity score reductions of 35–55% and plasma histamine decreases, but these findings cannot be extrapolated to IgE-mediated pollen-triggered allergic rhinitis. One small randomized open-label study (Khan et al., 2020) examined dietary modification in allergic rhinitis patients but did not isolate low-histamine diet effects during pollen season with validated rhinitis-specific outcomes.
How it works
Pollen triggers IgE-mediated mast cell degranulation, releasing endogenous histamine independently of dietary intake; however, the cumulative histamine threshold hypothesis proposes that dietary histamine additively burdens total circulating histamine when diamine oxidase (DAO) capacity is impaired, potentially lowering the threshold at which symptoms manifest. This additive mechanism is plausible but unvalidated in atopic individuals with pollen allergy, as DAO activity has been observed to remain unchanged even when plasma histamine decreases with dietary restriction.
Confidence: insufficient
Does alcohol consumption worsen hayfever symptoms and through which mechanisms?
Alcohol consumption appears to exacerbate symptoms in individuals with pre-existing allergic rhinitis rather than causing the disease de novo, with 7.6% of the general population reporting alcohol-induced upper airway symptoms that are 3-8x more prevalent in those with existing AR. However, Mendelian randomization analyses found no causal evidence that alcohol consumption causes allergic rhinitis (OR 0.91, 95% CI 0.81–1.02), suggesting observational associations may reflect confounding rather than direct causation. Sex-dependent effects have been noted, with associations more pronounced in males than females.
How it works
Alcohol and its metabolite acetaldehyde competitively inhibit diamine oxidase (DAO), the primary enzyme responsible for histamine degradation, while simultaneously triggering mast cell degranulation and histamine release, resulting in elevated tissue histamine levels that can amplify existing allergic responses. In susceptible individuals—particularly those with ALDH2 deficiency or aspirin-exacerbated respiratory disease (AERD)—polyphenolic compounds in alcoholic beverages (especially red wine) can additionally activate basophils and further drive upper airway inflammation.
Confidence: moderate
Do DAO-supporting supplements (vitamin B6, vitamin C, copper) reduce histamine intolerance symptoms?
Evidence for DAO-supporting supplements (vitamin B6, vitamin C, copper) reducing histamine intolerance symptoms is primarily mechanistic and preliminary, with no human RCTs directly testing these micronutrients as isolated interventions for HIT symptom reduction. One in vitro functional assay (n=6) suggests vitamin B6 status modulates DAO efficacy, showing ~20% greater histamine elimination in high-B6 versus low-B6 samples, while copper's role as the catalytic center of DAO is well-established biochemically but unquantified in clinical outcomes. Notably, combined vitamin C and copper supplementation raised safety concerns in a mouse model, producing oxidative renal injury via Fenton chemistry, complicating their co-administration.
How it works
DAO is a copper-dependent amine oxidase that degrades histamine via oxidative deamination, requiring copper (Cu²⁺) at its active site for electron transfer and vitamin B6 (pyridoxal-5'-phosphate) for topaquinone (TPQ) cofactor biogenesis and active-site stabilization; vitamin C may support DAO indirectly by aiding copper redox cycling and has independent histamine-lowering properties, though paradoxically can become pro-oxidant when combined with free copper.
Confidence: low
Do different alcohol types (red wine, white wine, beer, spirits) differ meaningfully in their histamine content and histamine-triggering effect on allergic rhinitis symptoms?
Red wine consistently contains the highest histamine levels (60–3,800 µg/L) among alcoholic beverages, substantially exceeding white wine (3–120 µg/L), beer (21–305 µg/L), and sparkling wine (15–670 µg/L), with spirits data remaining poorly quantified. A controlled provocation study (n=28) demonstrated that 125 mL red wine delivering ~50 µg histamine produced significant plasma histamine elevation (p<0.01) and rhinitis-like symptoms in 22/28 histamine-intolerant participants, supporting clinical relevance of these content differences. However, no RCTs have directly compared symptom outcomes across beverage types specifically in allergic rhinitis patients, limiting firm beverage-specific recommendations.
How it works
Histamine in fermented beverages—particularly elevated in red wine due to prolonged skin contact and malolactic fermentation by lactic acid bacteria—is absorbed enterally and raises systemic histamine load, with ethanol simultaneously triggering endogenous mast cell degranulation and inhibiting diamine oxidase (DAO), the primary gut enzyme responsible for histamine catabolism, thereby prolonging and amplifying exposure in sensitized nasal mucosa.
Confidence: low
Does meal timing relative to peak pollen exposure windows affect allergic rhinitis symptom severity?
No direct clinical evidence demonstrates that meal timing relative to peak pollen exposure windows affects allergic rhinitis symptom severity. However, robust evidence confirms that allergic rhinitis symptoms and mast cell/basophil reactivity follow strong circadian rhythms, with worsening typically overnight and in early morning, and a mouse model study demonstrates that antigen timing within the circadian cycle significantly affects allergic symptom severity. The specific intersection of meal timing, dietary histamine load, and pollen exposure windows remains entirely unstudied in human clinical trials.
How it works
The circadian clock regulates mast cell degranulation capacity, IgE-receptor expression, and basophil allergen reactivity on a ~24-hour cycle, meaning immunological sensitivity to allergens—including pollen—varies predictably across the day. Theoretically, meals high in histamine or histamine-releasing foods consumed during circadian windows of peak mast cell sensitivity could additively amplify total histamine load, but this pathway has not been experimentally confirmed in the context of pollen exposure.
Confidence: insufficient
Can oral DAO enzyme supplementation taken before high-histamine meals measurably reduce allergic rhinitis symptom spikes in hayfever sufferers?
No RCTs or systematic reviews directly demonstrate that oral DAO supplementation before high-histamine meals reduces allergic rhinitis or hayfever symptom spikes; evidence is limited to observational data showing an association between low DAO activity and greater AR severity (e.g., lower nasal peak inspiratory flow), and small trials in related histamine-mediated conditions (migraine, chronic urticaria, histamine intolerance) showing modest symptomatic benefit. Extrapolation to AR-specific meal-triggered symptom spikes remains speculative, as no study has used quantitative AR endpoints such as TNSS or VAS scores in response to DAO supplementation with high-histamine food challenges.
How it works
Intestinal DAO catabolizes luminal dietary histamine before it can be absorbed; deficiency allows histamine to enter systemic circulation, where it may activate H1–H4 receptors in nasal mucosa and potentiate IgE-mediated responses in atopic individuals, potentially worsening rhinitis symptoms. Oral DAO acts locally in the gut lumen and is not systemically absorbed, meaning its benefit depends on reducing the dietary histamine load contributing to systemic histamine excess rather than directly targeting nasal mucosal inflammation.
Confidence: low
Where the evidence runs out
No prospective RCTs have directly measured cumulative histamine flux from multiple simultaneous sources against objectively quantified symptom thresholds, leaving the bucket model mechanistically plausible but unvalidated as a quantitative framework. Key unknowns include precise plasma or tissue histamine levels that reliably predict symptom onset across individuals, the relative contribution of endogenous versus dietary sources, and whether DAO supplementation meaningfully raises the threshold in a clinically reproducible way. Quantitative thresholds for symptomatic histamine exposure remain poorly defined and are likely highly individual, depending on DAO/HNMT activity, gut microbiome, and concurrent dietary factors. Evidence for histamine liberators is largely mechanistic and observational, with no large RCTs establishing reliable dose-response relationships or confirming clinical relevance in allergic rhinitis specifically. All available evidence is observational with no control groups, no randomized trials, and no longitudinal data confirming causality; critical confounders such as diet, genetics, and gut microbiome are unaddressed, and no studies have directly quantified systemic histamine levels in DAO-deficient AR patients to confirm the proposed amplification mechanism. No RCTs, systematic reviews, or prospective studies have directly assessed low-histamine diet effects on validated rhinitis symptom scores (e.g., TNSS, RQLQ) during controlled pollen season exposure, leaving the clinical utility of this intervention entirely unestablished for hayfever. Critical unknowns include whether dietary histamine load meaningfully modulates IgE-mediated pollen responses, what histamine thresholds are relevant in atopic individuals, and whether any benefit would be clinically meaningful relative to established pharmacotherapy. Rigorous mechanistic studies directly quantifying DAO inhibition, histamine levels, and mast cell activity specifically in allergic rhinitis patients following alcohol challenge are lacking, leaving the biochemical pathway incompletely validated in this population. The causal relationship between alcohol and AR onset remains unconfirmed by genetic methods, and it is unclear whether symptom exacerbation in existing AR patients reflects a pharmacological histamine-load effect, polyphenol-driven immune activation, or unmeasured confounders. No human RCTs have evaluated vitamin B6, vitamin C, or copper supplementation as primary interventions with validated HIT symptom scores or quantified DAO activity as outcomes, leaving clinical translation of mechanistic findings entirely unestablished. Critical unknowns include optimal dosing, safety thresholds (particularly for copper toxicity and the adverse C+Cu interaction), and whether benefit is restricted to individuals with confirmed deficiency in these micronutrients or specific AOC1 gene polymorphisms. No RCTs or systematic reviews have directly measured allergic rhinitis symptom scores (e.g., TNSS) following controlled cross-beverage challenges, and the clinical significance of histamine content differences is further confounded by the absence of standardized spirits histamine data, wide vintage-to-vintage variability within beverage categories, and the lack of studies co-measuring DAO activity alongside symptom outcomes in rhinitis-diagnosed cohorts. No human clinical trials or observational studies have examined meal timing relative to pollen exposure windows as a variable in allergic rhinitis symptom severity, leaving the histamine load interaction hypothesis entirely untested. Critical missing data include controlled measurements of total histamine burden (dietary plus endogenous) across pollen exposure windows, standardized symptom scoring (e.g., TNSS) stratified by meal timing, and whether circadian mast cell sensitivity peaks meaningfully overlap with real-world pollen dispersal patterns. No AR-specific intervention trials exist measuring meal-triggered symptom spikes before and after DAO supplementation, and the single observational study linking DAO deficiency to AR severity (n=108) was cross-sectional with no causal inference possible. Critical unknowns include optimal dosing for atopic populations, whether hayfever sufferers have systematically lower DAO activity than non-atopic controls, and whether dietary histamine load meaningfully compounds aeroallergen-driven nasal inflammation in real-world settings.
References
- 1.Maintz L, Novak N · 2007 · Histamine and histamine intolerance
- 2.Sánchez-Pérez S, Comas-Basté O, Veciana-Nogués MT et al. · 2021 · Low-Histamine Diets: Is the Exclusion of Foods Justified by Their Histamine Content?
- 3.Duelo A, Comas-Basté O, Sánchez-Pérez S et al. · 2024 · Pilot Study on the Prevalence of Diamine Oxidase Gene Variants in Patients with Symptoms of Histamine Intolerance
- 4.Mayo-Yáñez M, Díaz-Díaz A, Vázquez-Barro JC et al. · 2021 · Relationship between allergic rhinitis and diamine oxidase activity: A preliminary report
- 5.He Y, Xu Y, Lin Z et al. · 2025 · Association between alcohol consumption and allergic rhinitis in US adults
- 6.Zimatkin SM, Anichtchik OV · 1999 · Alcohol-histamine interactions
- 7.Hrubiško M, Danis R, Huorka M et al. · 2021 · Histamine Intolerance — The More We Know the Less We Know. A Review
- 8.Komericki P, Klein G, Reider N et al. · 2010 · Histamine intolerance: lack of reproducibility of single symptoms by oral provocation with histamine: A randomised, double-blind, placebo-controlled cross-over study
- 9.Duelo A, Sánchez-Pérez S, Ruiz-León A et al. · 2024 · Study Protocol for a Prospective, Unicentric, Double-Blind, Randomized, and Placebo-Controlled Trial on the Efficacy of a Low-Histamine Diet and DAO Enzyme Supplementation in Patients with Histamine Intolerance
- 10.Izquierdo-Casas J, Comas-Basté O, Latorre-Moratalla M et al. · 2018 · Diamine oxidase (DAO) supplement reduces headache in episodic migraine patients with DAO deficiency: A randomized double-blind trial
This article is general information about hayfever, not medical advice. It should not replace guidance from your GP, pharmacist or allergy specialist — particularly if you are pregnant, treating a child, or managing asthma alongside hayfever. Read our medical disclaimer.
