Salicylate sensitivity means reacting to salicylates, a family of chemicals concentrated in aspirin and related painkillers and present in far smaller amounts in many plant foods. The reaction is real and well documented for the drugs. In some people with asthma and nasal polyps, aspirin and related painkillers such as ibuprofen trigger wheezing and a blocked, runny nose within minutes to hours. Whether the traces of salicylate in fruit, vegetables, herbs and tea cause symptoms of their own is far less certain, and the research behind low-salicylate diets is thinner than most pages on the subject suggest. No test can identify salicylate sensitivity, ours included. This guide covers what salicylates are, where the evidence is solid and where it runs out, and how to approach the question safely.
If a painkiller or a food has ever brought on swelling of your lips, tongue or throat, widespread hives, or any change to your breathing, treat it as a possible allergy and take it to your GP before investigating anything at home. Call 999 at the time if someone struggles to breathe, their face or throat swells, or they become faint or drowsy after taking a medicine or eating. Working out whether a reaction is an allergy or an intolerance is a job for a GP and an allergy clinic, never for a home test.
What are salicylates and where are they found?
Salicylates are chemicals that plants make to defend themselves against insects and disease. Aspirin, acetylsalicylic acid, is the concentrated manufactured member of the family, and several other everyday painkillers act on the same enzyme. In food, the amounts are small. A 1985 analysis of 333 foods found the highest levels in herbs and spices, including curry powder, paprika, thyme and rosemary, with substantial amounts in tea and measurable levels in most fruit, particularly berries and dried fruit. Vegetables ranged widely, and cereals, meat, fish and dairy contained none or next to none.
The scale of the difference matters. Food salicylate is measured in fractions of a milligram to a few milligrams per portion, while one adult aspirin tablet contains 300 milligrams. Even a diet heavy in fruit, spice and tea supplies far less salicylate in a day than a single tablet delivers in one dose. Any claim that food salicylate causes symptoms has to account for that gap, and the gap is one reason researchers remain divided about it.
The strongest evidence involves aspirin, not food
Aspirin-exacerbated respiratory disease is the condition where salicylate reactions are beyond doubt. People affected have asthma, usually starting in adulthood, and nasal polyps that keep returning, and taking aspirin or another anti-inflammatory painkiller brings on wheezing, a blocked and streaming nose and sinus pressure. A 2015 pooled analysis of 27 studies found it affects around 7 in 100 adults with asthma, and around twice that proportion of people with severe asthma.
The mechanism is not an allergy. A 2008 review sets out that no antibody is involved. Aspirin and its relatives block an enzyme called cyclo-oxygenase, and in susceptible people the blockade shifts the balance between two families of chemical messengers, prostaglandins and leukotrienes, towards the ones that inflame the airways. Because the reaction runs through an enzyme rather than through the immune system recognising one particular molecule, it crosses between chemically different painkillers, which a true allergy would not. The same review describes hives and gut inflammation as rarer forms the reaction can take.
Does the salicylate in food cause symptoms too?
This is where the evidence thins out. Almost every trial of a low-salicylate diet has been run in people who already have the confirmed drug reaction, to see whether the diet eases their nose and sinus symptoms. In a 2016 trial across four Canadian centres, 30 people with aspirin-exacerbated respiratory disease spent six weeks on their usual diet and six weeks on a low-salicylate diet in random order. Their reported nasal and asthma symptoms improved during the diet weeks, and so did what specialists could see on nasal examination. A 2024 Polish study followed 40 people with the same condition through 12 weeks of the diet and recorded a similar easing of nasal symptoms, though it had no comparison group, so the diet cannot take all the credit.
A 2024 systematic review that gathered 21 studies of naturally occurring food chemicals concluded that this is the one setting where low-salicylate diets have real support, sino-nasal symptoms in people with aspirin-sensitive asthma. For people with other symptoms and no drug reaction, it found the evidence too limited to draw conclusions. These trials also say nothing about how common food salicylate reactions are, because they all start from people already known to react to the drugs.
What about skin and gut symptoms?
For skin, the entire blinded evidence base amounts to four studies. A 2025 pooled analysis could find only four trials, covering 188 people in total, in which people with eczema were given salicylate in disguised capsules after an elimination diet. In the two trials that could be combined, around half flared afterwards. That sounds striking, but the authors grade the evidence as low certainty, because the studies are old, small and inconsistently designed, and they call for better trials before anything firm is concluded.
For the gut, there is less still. A German gastroenterology group that has studied these reactions for decades describes abdominal pain and diarrhoea as part of the picture, and estimated from its own records that between 2 and 7 in every 100 of its patients with inflammatory bowel conditions and food allergy are affected. That is one clinic's caseload, not a population figure. A 1998 review of food and IBS trials noticed that the foods people reacted to most often in challenge tests tended to be high in salicylates, then noted that every trial it examined had serious design problems. Nearly thirty years on, no blinded trial of a low-salicylate diet for gut symptoms alone has followed it up. If salicylate does trouble some guts, the studies that would show it have not been done.
Gut symptoms that follow meals also have better-evidenced explanations, which is why they are checked first. FODMAP carbohydrates and lactose both cause bloating, cramps and loose stools through mechanisms that can be demonstrated, and the range of mechanisms that can sit behind a food intolerance is wider than any single chemical.
How would you find out if salicylates were the problem?
There is no test for salicylate sensitivity. No blood marker, no breath test and no skin test exists for it, on the NHS or anywhere else. The only way to examine the question is a supervised elimination diet. Eat low-salicylate for a set period, then reintroduce foods step by step and watch whether symptoms track them. A UK review of food chemical sensitivity supports trying that for a limited period in selected people, on three conditions. The diet is planned with a registered dietitian, it is time-limited, and the reintroduction step actually happens, because reintroduction is the only part that tests the idea.
The conditions exist because this is not a mild diet. Salicylates sit in most fruit, many vegetables, herbs, spices and tea, so a strict version cuts across exactly the foods that supply fibre, vitamins and variety. The record in children is a warning. A 2013 Australian review of 74 children who had been put on salicylate elimination diets, mostly for eczema or behaviour, found no published evidence that the diets help either, and recorded harm in nearly half the children whose outcomes were known, including nutritional deficiencies, food aversion and four eating disorders. A child's diet is never restricted this way without advice from a GP or a paediatric dietitian. Anyone with a history of disordered or restrictive eating should involve their GP or a dietitian before removing any food group.
Two medicine points sit naturally with a pharmacist. If you take low-dose aspirin prescribed for your heart or circulation, never stop it over a suspected food issue. Raise the question with your GP or pharmacist instead. And if an anti-inflammatory painkiller has ever made your asthma or breathing worse, say so whenever you buy painkillers, because ibuprofen from a supermarket shelf belongs to the same family.
Can a food intolerance test detect salicylate sensitivity?
No. A salicylate reaction is a chemical response that runs through the same enzyme pathway as aspirin. No antibody takes part, so no consumer test can measure it, including ours. A test report claiming to have found a salicylate intolerance is claiming something no current test can show.
What our IgG antibody test measures is different. It looks for IgG antibodies your immune system has made against 270 individual foods and drinks, and an elevated result may indicate a food sensitivity to that specific food. The distinction is useful here in one situation. If one particular food keeps causing trouble while other high-salicylate foods cause nothing, the chemical is unlikely to be the explanation, and whether your body is reacting to that specific food becomes the more useful question. Our clinical team reads results with exactly that distinction in mind.
Salicylate is also not the only food chemical investigated this way. The evidence for histamine intolerance is contested in similar ways, the two food lists overlap, and the two questions are often worked through together, which is a further reason the sorting out belongs in a dietitian's structured elimination and reintroduction rather than in guesswork.
When should you see a GP?
See your GP if any painkiller has ever made your breathing worse, even mildly, and mention it before you are prescribed anything new. See your GP too if you have asthma alongside a nose that is always blocked or a sense of smell that is fading, because nasal polyps can be examined and treated. For gut symptoms, book an appointment before any food experiment if you have blood in your stool, unexplained weight loss, a change in bowel habit lasting more than three weeks, difficulty swallowing, persistent vomiting, constant tiredness that could signal iron-deficiency anaemia, new gut symptoms over the age of 50, or a family history of bowel or ovarian cancer. Any reaction involving swelling, widespread hives or difficulty breathing is a 999 call at the time it happens, and an allergy question for your GP afterwards.
This guide is for information only and does not replace medical advice. Speak to your GP or pharmacist about your own symptoms.
Sources
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