Histamine Intolerance: Symptoms, Foods and Tests
Medically Reviewed by Dr. Pedro Yelamo Vera, MD
Licensed Physician No. 484814280 · Official Medical College of Bizkaia (Spain)Last reviewed: 31 October 2026
Histamine intolerance causes flushing, headache and gut symptoms after food. Which foods to watch, why DAO tests mislead, and what actually helps.
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Dr. Pedro Yelamo Vera is an independent, bilingual GP licensed in Spain. Book a 15-minute video consultation in English or Spanish for €50, with a private electronic prescription issued under Spanish law when clinically appropriate.
Histamine intolerance means your body struggles to break down histamine from food and drink. It is thought to be linked to low activity of an enzyme in the gut called DAO. Symptoms such as headache, flushing, itching, a blocked nose or diarrhoea start soon after eating. There is no reliable test, so diagnosis is careful and step by step.
- Histamine intolerance is not an allergy, but the symptoms can feel very similar.
- Symptoms usually start 30 minutes to a few hours after high-histamine foods or alcohol.
- No blood test reliably diagnoses it, including the DAO test sold in many labs.
- The usual approach is a short low-histamine diet, then adding foods back one at a time.
- Swelling of the lips or tongue, trouble breathing or fainting after food is an emergency: call 112.
Dr. Pedro Yelamo Vera is a GP licensed in Spain (Colegiado No. 484814280).
For a medical emergency, call 112 or go to the nearest local emergency department. Do not wait for a video consultation or an online reply.
What is histamine intolerance?
Histamine is a natural chemical. Your body makes it, and many foods contain it. Most people break down food histamine in the gut with no trouble.
Allergy UK explains that some people have a reduced ability to do this. It is thought to be linked to low activity of an enzyme called diamine oxidase (DAO). Histamine then builds up and causes symptoms. In Spain you will see it called intolerancia a la histamina or déficit de DAO.
Experts still debate it. A German and Swiss allergy guideline says the evidence linking food histamine to symptoms is limited.
What are the symptoms of histamine intolerance?
Allergy UK lists these symptoms. They usually appear 30 minutes to a few hours after eating:
- Headache or migraine.
- Flushing, itching, a rash or hives.
- A blocked or runny nose.
- Tummy pain, bloating, nausea, vomiting or diarrhoea.
- A fast or irregular heartbeat.
- Wheezing, or swelling of the face, lips or eyes.
How much you tolerate can change from day to day. Stress, illness, hormones and some medicines all play a part.
Which foods are high in histamine?
Allergy UK names these as high in histamine or similar chemicals:
- Alcohol: wine (especially red), sparkling wine, beer and cider.
- Aged and fermented foods: mature cheese, cured meats such as jamón and chorizo, sauerkraut, soy sauce and miso.
- Fish: tuna, mackerel, sardines and herring, plus smoked, tinned or pickled fish.
- Some vegetables: tomatoes, aubergine and spinach.
- Other foods: chocolate, cocoa, some citrus and tropical fruit, peanuts and nuts.
Histamine can build up as food ages, especially fish that is not kept cold. Fresh food is often better tolerated than leftovers.
Is it histamine intolerance or something else?
Several conditions can look the same, so a doctor checks for them first:
- Food allergy. Reactions are often quick and can be severe.
- Irritable bowel syndrome (IBS), coeliac disease or lactose intolerance. These cause gut symptoms after food.
- Hives and allergic rhinitis from other triggers.
- Mastocytosis. This is a rare condition where cells release too much histamine.
Histamine fish poisoning is different. It is also called scombroid poisoning. Tuna, mackerel or sardines that were not kept cold can build up a lot of histamine. Spain's food safety agency (AESAN) says it causes flushing, hives, headache and a peppery taste. Symptoms start minutes to 2 or 3 hours after eating. It is usually mild and passes within hours. Cooking or freezing does not destroy the histamine.
Getting flushing, itching or gut symptoms after food or wine?
You can book a video visit with a GP licensed in Spain, in English or Spanish. He goes through your symptoms and food diary, checks for allergy and other causes, and helps you plan the next steps.
How is histamine intolerance diagnosed?
There is no reliable test. Allergy UK says so plainly. The German-Swiss-Austrian guideline says a DAO blood test is inconclusive.
In Spain you may be offered a DAO blood test (análisis de DAO) at a private lab. Neither Allergy UK nor the guideline supports using it to diagnose histamine intolerance. So a low result does not prove it, and a normal one does not rule it out.
Instead, doctors follow these steps:
- Rule out allergy, coeliac disease, IBS and other causes.
- Keep a food and symptom diary.
- Try a low-histamine diet for a short time.
- Add foods back one at a time to find your limit.
Reviews agree that a clear response to the diet is the main sign of histamine intolerance.
What is a low-histamine diet, and how long should you follow it?
Allergy UK suggests cutting out high-histamine foods for 2 to 4 weeks. Then you bring foods back one at a time to see what you tolerate.
- Eat fresh food. Cool leftovers quickly and eat them soon.
- Cut down on alcohol, mainly red wine.
- Work with a dietitian (dietista-nutricionista), especially if you already avoid other foods.
The guideline warns that many people follow strict diets for years. These are often far stricter than needed. The aim is a personal list of foods to limit, not a long list of bans.
Do DAO supplements or antihistamines help?
You will also see DAO capsules (suplementos de DAO). A review in Nutrients says they may be considered as an add-on to diet for some people. The evidence is still limited.
Antihistamines can ease symptoms. The same review advises short, planned use, with newer, less sedating antihistamines first. Allergy UK suggests carrying one for accidental exposure. See our guide to cetirizine in Spain. Ask a doctor or pharmacist which suits you, especially in pregnancy or for a child.
When should you see a doctor?
- You think food causes your symptoms. Get checked before you cut out food groups.
- You see blood in your stool, or your stools are black. MedlinePlus advises contacting a doctor right away for these.
- Your child has symptoms after food. Children need a proper diagnosis before any diet change.
Call 112 if, after food, someone has swelling of the tongue or throat, a hoarse voice, trouble breathing or swallowing, or feels faint. These are signs of anaphylaxis, a severe allergic reaction. MedlinePlus says to act right away. If they carry an adrenaline auto-injector, help them use it.
Talking it through with a doctor by video
Dr. Yelamo is a GP licensed in Spain. He sees adults, children and pregnant patients by video, every day from 07:30 to 20:30 (Spain time). In the visit he will:
- Go through your symptoms, triggers and food diary.
- Look for signs of allergy, coeliac disease or another cause.
- Agree a plan for a short trial diet, symptom relief and any tests or referral you need.
He does not promise any test or prescription before the visit. Where clinically appropriate, following a genuine evaluation. Treatment and prescriptions are issued solely at the doctor's discretion based on evidence-based clinical guidelines.
A prescription is never guaranteed: it is issued only where clinically appropriate after a genuine evaluation, as a private electronic prescription under Spanish law. This service is for urgent, non-emergency care. In an emergency, call 112.
See how the Urgent Care video visit works. It lasts 15 minutes and costs €50.
This guide is general information. It does not replace a consultation with your doctor.
Frequently asked questions
What are the symptoms of histamine intolerance?
Headache, flushing, itching or hives, a blocked or runny nose, a fast heartbeat, and tummy pain, nausea or diarrhoea. They usually start 30 minutes to a few hours after eating high-histamine foods.
Is histamine intolerance an allergy?
No. It is not an allergic reaction of the immune system, but the symptoms can feel very similar. Allergy tests are usually normal.
Is there a test for histamine intolerance?
There is no reliable test. German-speaking allergy societies say a DAO blood test is inconclusive. Diagnosis rests on ruling out other causes and on how you respond to a short low-histamine diet.
Which foods are high in histamine?
Alcohol, especially red wine, plus aged cheese, cured meats, fermented foods, some fish such as tuna and mackerel, tomatoes, spinach, aubergine, chocolate and some fruits and nuts.
Do DAO supplements work?
Evidence is limited. Reviews say they may help some people as an add-on to diet. Ask your doctor or pharmacist before you start one.
Can antihistamines help histamine intolerance?
They can ease symptoms. A review advises short, planned use, with newer, less sedating antihistamines first. Ask a doctor or pharmacist which suits you.
Sources
- Allergy UK: Histamine intolerance factsheet
- Reese et al. Guideline on suspected adverse reactions to ingested histamine (DGAKI, AeDA, GPA, SGAI, ÖGAI)
- Hrubisko et al. Histamine intolerance: a review (Nutrients)
- Comas-Basté et al. Histamine intolerance: the current state of the art (PubMed)
- MedlinePlus: Anaphylaxis
Related guides
Medical Citations & Sources
This content is written and reviewed by a licensed physician with reference to the following official health authorities.
