If you’re dealing with IBS and experiencing unexpected symptoms like headaches, skin rashes, or worsening digestive issues after eating certain foods, histamine intolerance could be playing a role. As I work with more IBS clients, I’ve noticed an increase in cases of histamine intolerance. In this blog post, we’ll dive deeper into the connection, and explore ways to manage both conditions.
What Is Histamine Intolerance?
Histamine is a natural compound involved in immune responses, digestion, and even brain function. In a healthy body, histamine is broken down effectively by enzymes like DAO (diamine oxidase). However, in some people, the body struggles to break down excess histamine, leading to histamine intolerance.
Common symptoms of histamine intolerance include:
- Headaches
- Bloating
- Fatigue
- Nasal congestion
- Rashes
- Digestive discomfort
These symptoms overlap with many common IBS issues, which is why histamine intolerance is often overlooked when treating IBS.
How Are IBS and Histamine Intolerance Linked?
The connection between IBS and histamine intolerance is complex, but there are six key ways these conditions interact:
1. Gut Inflammation and Permeability
In people who have IBS, there can be low-grade inflammation in the gut, and this inflammation can weaken the gut barrier. When the gut becomes more permeable—also known as ‘leaky gut’—it allows histamine and other inflammatory compounds to pass more easily into the bloodstream. This can aggravate IBS symptoms like bloating and stomach pain, while also causing histamine intolerance symptoms such as headaches.
2. Mast Cell Activation
Mast cells, which release histamine as part of the immune response, are often found in greater numbers in the intestines of IBS patients, particularly those with diarrhea-predominant IBS. This overactivation of mast cells can lead to digestive issues like diarrhea, cramping, and urgency, worsening both IBS and histamine intolerance. Some people with IBS may also have mast cell activation syndrome (MCAS), where these cells release too much histamine in response to mild triggers.
3. Altered Gut Microbiome
The gut microbiome plays a major role in both IBS and histamine metabolism. Certain bacteria produce histamine, while others help break it down. Dysbiosis, an imbalance of gut bacteria, is common in IBS and can result in increased histamine production or decreased histamine breakdown, triggering histamine intolerance symptoms. Conditions like SIBO (small intestinal bacterial overgrowth), which are prevalent in IBS, can also increase histamine production.
4. Visceral Hypersensitivity
People with IBS often experience visceral hypersensitivity, meaning their gut is more sensitive to pain and discomfort. Histamine can further irritate the gut lining, intensifying pain, cramping, and other digestive issues already present in IBS patients.
5. Serotonin and Histamine Interaction
Serotonin, a neurotransmitter that regulates gut motility, plays a key role in IBS, especially in those with constipation-predominant IBS. Histamine can affect serotonin pathways, leading to disruptions in digestion and worsening IBS symptoms like constipation or diarrhea.
6. Stress and the Gut-Brain Axis
Stress is a common trigger in both IBS and histamine intolerance. When under stress, the body releases cortisol, which can trigger mast cells to release histamine, further aggravating symptoms. Chronic stress also dysregulates the gut-brain axis, creating a cycle that worsens both histamine intolerance and IBS.
Foods High in Histamine
Certain foods are naturally high in histamine and may trigger symptoms for people with histamine intolerance. These include:
- Aged cheeses
- Fermented foods (like sauerkraut and kimchi)
- Alcohol
- Processed meats (like salami or bacon)
- Leftovers (as histamine levels increase the longer food is stored)
There are also histamine liberators, foods that trigger the release of histamine in the body, even though they don’t contain much histamine themselves. Examples include tomatoes, bananas, chocolate, and strawberries. If you suspect histamine intolerance, tracking your symptoms and food intake can help identify triggers.
Managing Histamine Intolerance and IBS
Managing both histamine intolerance and IBS requires a multi-faceted approach. Here are a few strategies:
1. Dietary Adjustments
Start by reducing or eliminating high-histamine foods from your diet to see if symptoms improve. After a period of avoidance, you can gradually reintroduce foods to test your tolerance. Keeping a food journal can be a helpful tool for tracking symptoms and potential food triggers.
2. Supplements
Some people with histamine intolerance benefit from taking DAO enzyme supplements, which help break down histamine from food. Antihistamines may also be helpful, though they treat the symptoms rather than addressing the root cause.
3. Improve Gut Health with Hypnotherapy
A key part of managing histamine intolerance in IBS is focusing on improving gut health. Anti-inflammatory foods, probiotics, and healing the gut lining can help increase DAO production and improve your body’s ability to handle histamine. In addition, gut-directed hypnotherapy has been shown to help reduce stress, calm the nervous system, and improve gut function. You can explore many different hypnotherapy sessions for IBS on The Calm and Happy Gut YouTube channel. You can also access over +100 audio sessions inside of The Calm Gut app which is now available on the app stores.
By addressing both gut health and stress, hypnotherapy can help you manage both IBS symptoms and histamine intolerance more effectively.
Conclusion
The connection between histamine intolerance and IBS is complex, involving gut inflammation, mast cell activity, microbiome imbalances, and stress. By understanding these links and adopting strategies like dietary changes, supplements, and therapies like gut-directed hypnotherapy, you can take steps toward managing both conditions.
If you think histamine intolerance could be contributing to your IBS, it’s worth exploring these approaches to help you find relief and improve your overall gut health.
