Endometriosis and Histamine: Understanding the Connection

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Full transcript of the original video, lightly edited for readability.

There's been discussions on how histamine and estrogen are the problem in the case of endometriosis. There has been discussions amongst women that histamine is estrogen and that they are interchangeable. But above all, there has been various medical professionals stating that endometriosis, which includes adenomyosis, for this video and context, it's an allergy problem. So we need to clarify this sea of information. The problem is not that people are talking about histamine. They should be. The problem is that we are creating a risk of repeating the exact same reductionist mistake we made with estrogen.

For years, endometriosis was treated like an estrogen only disease. So the logic became simple. Suppress estrogen, suppress the disease. And what happened? Some women improved, some didn't, some got worse. Some had surgery, hormones, more surgery, more hormones, and still ended up right back where they started. Why? Because estrogen was never the whole disease. It was one major node inside a much larger network. And now I'm seeing the same thing happen with histamine. People are saying it's histamine, it's mast cells, it's MCAS, it's an allergic disease.

And listen, there is truth in the mass cell conversation, but if we turn histamine into the new estrogen, we Learned nothing. And now we are risking repeating the same cycle, repeating a reductionist mistake. So let's explain why people are going down this route. Mast cells are found throughout the body. They're in the skin, they're in the gut, they're around blood, Vessels. They're near nerves. And yes, they're also found in the pelvic peritoneum. So when we find mass cells in endometriotic lesions, that matters, especially because lesions can create a micro environment that attracts them.

One major signal here is C C L2, also called M C P1. C C L2 acts like a recruitment signal. It attracts immune cells, including mass cells and macrophages, into the lesion environment. And here's the part that makes the estrogen connection important. Estrogen can stimulate C C L2 production in lesions. So now the lesion isn't just passively sitting there. It is creating a chemical signal that says, bring immune cells here, bring mast cells here, build inflammation here. And once mast cells are activated, they degranulate.

That means they spill out inflammatory chemicals into the surrounding tissue. And mast cells don't just release histamine. They release over 200 mediators. Histamine, tryptase, cytokines, prostaglandins, growth factors, V G F, NGF. All of these affect inflammation, vessel growth, and pain. Now, let's go deeper. Mast cells inside endometriotic lesions can express G protein coupled estrogen receptor 30, also called GPR30 or GPER. Estrogen can trigger fast non genomic responses. So when estrogen rises, especially around ovulation, it can activate mast cells through this G P R.

Pathway. That can result in mast cell activation and histamine release. So the logic makes sense. Estrogen rises, mast cells activate, histamine releases, inflammation increases, pain increases, and then histamine Participates in a feedback loop. So, yes, there is an estrogen histamine loop, but the loop is not the whole disease. It is one circuit. And this is where the nuance matters. Because when we look at histamine receptors, H1R, H2R, H3R, and H4R, we don't necessarily see this massive transcriptional increase between patients and controls.

That's important. What we see instead is more interesting. The tissue microenvironment appears to make the area hypersensitive to histamine. The issue is that the lesion environment makes the area behave as if it's primed. That's not a histamine only disease. That's a micro environment disease. That's a network disease. Now, does histamine play a role in pain? Absolutely. Histamine can stimulate H1 receptors on nociceptors, pain sensing nerves. That stimulation can make nerves more reactive. Mast cells also release NGF, nerve growth factor. NGF.

Encourages nerve sprouting and lowers the threshold for pain. Then we have F G F. 2, which has been connected to estrogen stimulated mast cell nerve sensitivity. And we have substance P and CGRP. These neuropeptides can amplify neurogenic inflammation, and the nerves can turn around and activate mast cells again. So now you have another loop. Mast cells activate nerves, nerves activate mast cells. Pain increases, inflammation increases, sensitivity increases. This is how pain becomes chronic. Now let's talk about M cast, pots, heads, and endometriosis.

There is a belief that mast cells may be a connecting point between these conditions. And that idea is not crazy. Mast cells can influence the nervous system, blood vessels, gut symptoms, and inflammation. If a woman has these shared symptoms, it makes sense to investigate that pattern. But that still does not prove endometriosis is a histamine disease. It proves that mass cells may be one of the shared biological bridges. A bridge is not the entire city. A node is not the entire network.

The histamine conversation is useful, but it becomes dangerous when it becomes reductionist. Because even if you block histamine, there are still other pathways that remain active. So, yes, H1 and H2 antagonists may help some women. Mast cell stabilizers may help some women. But they are not a complete disease model. They are tools. This is why I keep pushing back against single cause explanations. Endometriosis is not that simple. If we keep pointing to one gear and calling it the engine, we are going to keep failing women.

It is a neuro immune, endocrine disease. It is a genetic and epigenetic disease. It is a tissue remodeling disease. It is a pain sensitization disease. It is an immune evasion disease. It is a network failure. Is there a root mechanism that has gone wrong that connects it all? Most likely, as that's what I've been working on. But until that portion has been identified, my position is simple. Do not ignore histamine. Do not dismiss mast cells. Do not pretend antihistamines can't help.

But also do not Reduce endometriosis to an allergic condition when the evidence points to a larger dysregulated problem. And until we address the full network, women will keep getting partial answers for something that's a full body disease. And that is exactly the mistake we cannot afford to repeat.