Histamine Intolerance Symptoms, Diet & Treatment

Histamine intolerance (HIT) is thought to be associated with a buildup of histamine in the body, and symptoms happen when histamine accumulates faster than it can be broken down. Histamine intolerance symptoms vary and include a wide range of effects on the skin, gut, cardiovascular system, and more.  Histamine intolerance symptoms are often mistaken for allergies or other conditions, such as spontaneous urticaria, MCAS, or IBS. Histamine intolerance symptoms, such as sneezing and hayfever, are well known. But did you know that histamine can also cause headaches, rashes, diarrhea, and many other symptoms?

The enzyme responsible for breaking down histamine is called diamine oxidase (DAO). When DAO is deficient or not functioning properly, histamine builds up, and symptoms follow. Because DAO is produced in the intestines, anything that impairs gut health can reduce DAO activity, which is why histamine intolerance is more common in people with underlying digestive disorders.

Histamine is found naturally in the body and is a naturally occurring chemical stored primarily in mast cells. It plays important roles in immune function, the nervous system, and the inflammatory response. Histamine is also a natural component of many foods, and in people with HIT, dietary histamine can push the body past its tolerance threshold, triggering symptoms.

Histamine intolerance is more prevalent in people with underlying gastrointestinal conditions, because gut damage reduces DAO production.

Conditions associated with increased HIT risk include:

• Celiac disease
• Inflammatory bowel disease (IBD)
• Irritable bowel syndrome (IBS)
• SIBO (Small Intestinal Bacterial Overgrowth)

Certain medications can also block DAO activity (see the medication list below).

Certain foods can trigger histamine intolerance symptoms, but histamine intolerance is NOT a food allergy. Although some symptoms overlap, such as hives, flushing, or a runny nose, the underlying mechanism is entirely different. HIT results from histamine accumulation, not an IgE-mediated immune response.

If you have histamine intolerance:

• Standard allergy skin tests will be negative
• Blood allergy panels will be negative
• Symptoms may be delayed, not immediate

This distinction matters clinically. A negative allergy test does not rule out histamine intolerance.

Speak to your physician to evaluate other possible “look-alike” conditions first because there is currently no definitive test for histamine intolerance. It is a diagnosis of exclusion, meaning you have to make sure that other conditions are not causing your symptoms first. You don’t want to miss a diagnosis of other potential causes of similar symptoms because the treatment will be different.

Physicians can measure DAO activity and blood histamine levels, but DAO levels do not reliably correlate with symptoms, making interpretation of the results inadequate to diagnose histamine intolerance.

The standard approach to determine histamine intolerance is a trial of a low-histamine diet for at least three weeks after you have ensured nothing else is causing the symptoms. If symptoms improve significantly with dietary histamine reduction, histamine intolerance is likely.

Before beginning a low-histamine elimination diet, it is important to rule out conditions that can mimic HIT, including:

• True food allergies
• Mast cell activation syndrome (MCAS)
• Celiac disease
• Inflammatory bowel disease
• Fructose malabsorption
• MCAS
• SIBO
• Spontaneous Urticaria
• Colitis

Addressing these underlying conditions first often improves or resolves symptoms of histamine intolerance on its own.

Successful management of histamine intolerance requires a multi-layered approach. Diet alone is rarely sufficient. Treating underlying conditions is the essential first step.

1. Treat Underlying Conditions First

Improving gut health directly improves DAO production and histamine clearance. Treating conditions like IBS or SIBO frequently reduces histamine intolerance symptoms, sometimes dramatically.

2. Diet: The Low-Histamine Diet

The primary dietary intervention is a low-histamine diet. This is an elimination diet followed by a structured reintroduction phase to identify personal tolerance levels. Some people also benefit from intermittent fasting or a fasting-mimicking diet.

If you are already following a gluten-free diet or low-FODMAP diet, layering a low-histamine diet on top can be nutritionally challenging. Working with a qualified healthcare provider is strongly recommended.

3. Sleep

Aim for 7–8 hours per night. Sleep deprivation worsens inflammation and can amplify histamine intolerance symptoms. Certain nutrients may support sleep quality. See this article on magnesium for more information.

4. Exercise

Any movement helps. Aim for 30–60 minutes of physical activity daily. Even 15 minutes provides measurable benefit. Consistent, moderate exercise supports overall gut health and immune regulation.

5. Stress Management and Relaxation

Stress activates mast cells and promotes histamine release. Effective relaxation strategies include:

• Breathing exercises or progressive muscle relaxation
• Yoga and meditation
• Time with supportive friends and family
• Music, reading, or other personally restorative activities

6. Social Support

Managing dietary restrictions alongside a chronic health condition is stressful. Seek support from family, trusted community members, faith organizations, and online or local patient groups. Reducing negative social interactions supports healing.

7. Medications

Depending on symptoms, a physician may recommend:

• Antihistamines (H1 and/or H2 blockers)
• Topical steroids or creams for skin symptoms
• Oral steroids for acute flares
• Topical plant-based or homeopathic creams for mild rashes

8. Supplements

Evidence is limited, but the following supplements are sometimes used under practitioner guidance: Vitamin C, Vitamin B6, Zinc, Copper, Magnesium, Mangosteen, Quercetin, DAO promoters, and DAO enzyme supplements. Note that supplements carry risks; always use them under the guidance of a qualified practitioner.

Find supplements Dr. Burkhart uses for histamine intolerance here

9. Helpful Tools

• Histamine content food app looks up histamine levels in specific foods
• Symptom tracker app tracks your food and symptoms to identify patterns
• A low-histamine cookbook is especially helpful during the elimination phase

For a comprehensive guide, see: The Low Histamine Diet: What Is It And Does It Work?

Lower-Histamine Foods (Generally Better Tolerated)

• Proteins: Fresh (not canned, smoked, or aged) meat and fish
• Fruit: Most fresh fruit except strawberries and citrus
• Vegetables: Most fresh vegetables except tomatoes, spinach, and cabbage
• Grains: Rice, corn, millet, oats, sorghum
• Fats: Most cooking oils

Key principle: Eat fresh. Freshness matters more than the specific food.

Fermented and aged foods are some of the biggest culprits, as they are very high in histamine. The list below reflects commonly accepted high-histamine foods and histamine liberators. Keep in mind that available data varies, and the science continues to evolve.

• Alcohol: Red wine, champagne, beer, white wine
• Fermented or smoked proteins: Sardines, mackerel, herring, tuna, salami
• Pickled or canned foods: Sauerkraut, pickles, relishes, soy sauce
• Fermented dairy: Yogurt, kefir, buttermilk
• Aged cheeses: Parmesan, Gouda, Swiss, cheddar
• Fruit: Dried fruit, strawberries, citrus
• Vegetables: Tomatoes and tomato products, spinach
• Legumes: Chickpeas, soybeans, peanuts
• Other: Cinnamon, chocolate, wheat
• Histamine liberators: Citrus, papaya, pineapple, nuts, strawberries, egg whites, food additives
• DAO blockers: Alcohol

The following medications inhibit DAO enzyme activity and may worsen histamine intolerance symptoms:

Acetylcysteine • Aspirin • Ambroxol • Aminophylline • Amiloride • Amitriptyline • Cefuroxime • Cefotiam • Cimetidine (Tagamet) • Ciprofloxacin • Cyclophosphamide • Contrast media • Docein • Diazepam (Valium) • Haloperidol (Haldol) • Metamizol • Metoclopramide (Reglan) • Naproxen (Aleve) • Narcotics/Thiopental • Noscapine • Pancuronium • Prilocaine • Verapamil

If you take any of these medications and suspect histamine intolerance, discuss alternatives with your prescribing physician before making any changes.

Q: What is the most common symptom of histamine intolerance? 

Bloating is the most common symptom, but histamine intolerance causes different symptoms in each person. Well, most people do experience bloating. I also commonly see patients with histamine intolerance who experience headaches, anxiety, sleep disruption, rashes, or other digestive symptoms. Symptoms also tend to worsen as the day goes on, as total body histamine load increases depending on diet, stress, and other factors.

Q: Is histamine intolerance the same as a histamine allergy? No. Histamine intolerance is not an allergic reaction, but symptoms can look very similar to a food allergy. Typically, symptoms of histamine intolerance occur 2 to 3 hours after high histamine foods, if foods are going to trigger the symptoms. Allergy skin tests and blood panels will be negative, but sometimes it can be difficult to differentiate, so it is important to consult with your healthcare provider to help you differentiate.

Q: Can histamine intolerance be cured? In many cases, symptoms can be significantly reduced or resolved by treating underlying conditions (such as celiac disease, SIBO, or IBS, following a low-histamine diet, and supporting DAO function. It may not be permanent; many patients regain tolerance once gut health improves.

Q: What is the best test for histamine intolerance? There is no definitive single test. DAO activity and blood histamine levels can be measured, but do not always correlate with symptoms. A trial of a low-histamine elimination diet remains the most clinically useful diagnostic tool.

Q: What foods are highest in histamine? Fermented and aged foods carry the most histamine: red wine, aged cheeses, cured meats, sauerkraut, vinegar, smoked fish, and fermented dairy products. Tomatoes, spinach, and certain fruits (strawberries, citrus) are also high.

Q: Can medications cause histamine intolerance symptoms? Yes. Many common medications, including aspirin, some antibiotics, acid-blocking drugs like cimetidine (Tagamet), and certain blood pressure medications, inhibit DAO activity and can worsen histamine intolerance. Review all medications with your physician.

Q: How long does it take to see improvement on a low-histamine diet? Most people notice symptom improvement within 2–4 weeks of following a strict low-histamine elimination diet. Individual response varies depending on underlying conditions and how closely the diet is followed.

Q: Do I need to follow a low-histamine diet forever? No, the elimination phase is temporary. The goal is to identify your personal histamine threshold through a structured reintroduction, then build the least-restrictive diet that keeps you symptom-free. Working with a healthcare provider during reintroduction is recommended.

Q: Is histamine intolerance connected to celiac disease? Yes. People with celiac disease are at higher risk for histamine intolerance due to intestinal damage that impairs DAO production. Persistent symptoms on a gluten-free diet may sometimes be related to histamine intolerance. See: Non-Responsive Celiac Disease and Histamine Intolerance.

Q: Are there supplements that help with histamine intolerance? Some practitioners use DAO supplements, quercetin, vitamin C, vitamin B6, zinc, copper, magnesium, and mangosteen to support histamine metabolism. Evidence is limited in use only under the guidance of a qualified healthcare provider. Find supplements Dr. Burkhart uses for histamine intolerance here.

Because histamine intolerance is an emerging area of study, it is important to seek out reliable sources of information on the topic. And, due to the lack of a definitive test for histamine intolerance, it is vital to ensure other conditions are not responsible for your symptoms.  If you think you are experiencing symptoms of histamine intolerance, please avoid self-diagnosis and seek guidance. An ever-expanding list of practitioners, allergists,and immunologists are educating themselves about histamine intolerance. As the research continues to evolve, more answers will be discovered.

• Histamine Intolerance The Current State Of Art
• Comparing Histamine Intolerance And Mast Cell Disorder
• Considering Histamine In Functional GI Disorders
• Non-responsive Celiac Disease And Histamine Intolerance
• Histamine Intolerance And Functional Gut Disorders