MCAS: Why So Many People Feel Stuck — and Where I Start Instead

There has been a lot of conversation lately around MCAS (Mast Cell Activation Syndrome) and histamine intolerance. Because MCAS can be difficult to diagnose, the discussion often gravitates toward symptom management and supportive therapies rather than clarity around what’s actually driving the reactivity.

Mast cell stabilizers are a frequent focus, along with supplements like quercetin, luteolin, and DAO enzymes. Many people experiment with a low-histamine diet. Mold exposure, COVID, and Lyme are commonly suspected when symptoms worsen or seem to appear suddenly. Medications such as Zyrtec and cromolyn also come up often and are regularly listed on my health intake questionnaire.

By the time people find me, they are often taking two or three mast cell stabilizers, with twenty or thirty different supplements lined up on their kitchen counter.

They’ve tried multiple healing programs, parasite cleanses, and heavy-metal protocols. They’re down to four or five “safe” foods. And despite all of this effort, many still feel stuck — and often discouraged — with very little lasting improvement.

While the right combination of supports can sometimes provide relief, sustained healing is uncommon. More often, people end up in a cycle where one symptom improves, only for another to take its place.

What I see, again and again, is that meaningful change begins when the body finally has enough safety and stability to stop bracing.

MCAS Is Not One Thing

MCAS isn’t a single diagnosis or a single trigger. It’s a state of reactivity — a system that’s been under pressure for a long time and never really got a chance to come back down.

Mast cells are doing exactly what they’re designed to do: stay alert, stay responsive. But over time, the threshold for activation drops. Smaller stressors create bigger reactions. The system gets louder and soon you realize that your flares are more on the weekend, after a visit with your mother in law or at certain times of your menstrual cycle. It all becomes really confusing. AND because mast cells are also hanging out and communicating with your brains microglial, you might also be feeling pretty depressed and down throughout this process. Anyone noticing how different people seem post covid?

So What Does This Actually Mean?

It means we need to talk honestly about root causes — a phrase that gets used constantly, and yet is often misunderstood in practice.

There are many possible contributors to mast cell activation: infections, mold, toxins, hormones, nutrient deficiencies, emotional stress, nervous system overload. Most people have more than one and almost all MCAS sufferers have a significant history of trauma or prolonged stress.

But here’s the part that matters most: no matter what the root cause ends up being, if the system isn’t stable, deeper work often doesn’t hold and it becomes an endless cycle of whack a mole.

When mast cells are firing frequently, the body stays sensitized and everything feels amplified. If we try to push detox, immune treatment, or aggressive protocols at that point, people usually feel worse.

Sometimes stabilization includes medications. Cromolyn sodium. Ketotifen. These can be genuinely helpful for certain people. They don’t fix everything, but they can take the edge off enough for the system to breathe.

Nutritional supports might include DAO enzymes, vitamin C, B vitamins, peptides such as KPV and gentle liver support — especially when the gut is involved.

But we usually learn pretty quickly that these things aren’t the answer. They can help the body to regulate instead of constantly reacting, but they aren’t where healing stops.

Histamine Isn’t Just About Food

One of the biggest misunderstandings I see is thinking histamine is only a food issue.

It’s not.

Histamine rises when blood sugar drops. When sleep is poor. When digestion is strained. When circadian rhythm is off. When the nervous system is overwhelmed. Emotional stress counts just as much as physical stress.

That’s why someone can eat “perfectly” and still flare after smelling bleach, flying on a plane, dealing with pressure changes, or simply moving through a really full, demanding week at work.

Multiple inputs fill the histamine bucket — and eventually it overflows.

AND instead of constantly asking ourselves, what is contributing to my flares, we also need to be asking, what helps my body to feel safe? What are my current stressors?

Safety isn’t a mindset. It’s a physical state the nervous system experiences and so we need to be willing to feel into our body and ask the hard questions.

And no — endlessly scrolling on your phone doesn’t create safety. That dopamine hit might blunt symptoms for a few minutes, but the crash that follows often hits harder. And boy can there be dopamine handling issues in those dealing with MCAS. More on this in another a future post!

What does create safety?
Routine! The body doesn't like surprises! Also, warmth, familiar foods, gentle morning light, or slowing the pace just enough that the day doesn’t feel like a constant sprint. When the nervous system settles, mast cells do too!

The “Immune Buckets” WE are Carrying

I often explain this in terms of buckets.

We all have them — stress, chemical exposure, decision fatigue, poor sleep, blood sugar swings, sensory overload (a BIG one). When enough buckets are full, symptoms show up.

Healing doesn’t mean emptying everything at once. That’s overwhelming and unrealistic. It usually starts with a few small tweaks.

Preparing the night before so mornings aren’t chaotic.
Simplifying meals - preparing dinner in the morning or batch cooking.
Prepping protein so dinner feels doable.
Leaving early enough to stop for coffee and feel like a person, not a machine/chauffeur always on the go.
Reducing harsh cleaning products and choosing scents/essential oils for your home that help to stabilize your nervous system. Color therapy, choose a flower that makes you feel good and get that on your table each week. For me, it’s a sunflower during the warmer months.
Turning down the constant stream of emails and notifications. Putting your phone away for hours at a time. Turning on music that you love! Dancing!

The Basics We Skip (and Shouldn’t)

Even in thoughtful protocols, I see the same foundations missed.

Digestion and absorption are huge. If food isn’t being broken down and absorbed, nutrients don’t reach the systems that need them, and the immune system stays irritated. Low stomach acid, poor bile flow, and gut inflammation are incredibly common in MCAS.

Anemias are another big one — and I honestly don’t understand why this gets skipped so often. Iron status matters. Oxygen delivery matters. Get this stable first, or at least work on it alongside everything else.

Blood sugar matters more than most people realize. Drops signal danger to the body and drive stress hormones that activate mast cells.

Regular bowel movements matter because inflammatory mediators need a clear way out. When elimination is slow, symptoms linger.

Knowing your menstrual cycle! There are times throughout your cycle where you are going to be more susceptible. Know when this is so that you can prepare yourself for success.

And sleep matters. A lot. Poor sleep keeps histamine high and the immune system dysregulated.

These aren’t advanced concepts.
They’re simple. They’re just not glamorous and costly.

Why This Gets Skipped

Sometimes these steps get skipped because clients don’t want to start there. They want relief — which is understandable — and foundational work can feel slow or inconvenient.

Other times, foundations are skipped because they don’t sell well. They aren’t exciting. They don’t come with instant buy-in. And in some wellness spaces, that means they’re bypassed in favor of expensive protocols that look more impressive.

Neither approach helps.

Skipping steps doesn’t speed things up. It usually makes the whole process harder and frankly - incomplete.

Why I Don’t Skip Them

I’ve learned that progress comes from addressing all the root causes — and that root causes are often simpler than we expect, even when Lyme, co-infections, or other complex illnesses are present.

Sometimes it’s the easy stuff that shifts things the most.

That means making sure blood sugar is steady. Digestion is working. Bowel movements are regular. Sleep is supported. Laughter!

Favorite supports: Available via Fullscript for a 10% discount.

GI Hist - Neurobiologix: This formula supports more than gut histamine by helping regulate immune and inflammatory pathways throughout the body. By calming reactivity and supporting antioxidant and detox processes, it helps to improve digestive symptoms, immune balance, and systemic symptoms linked to histamine and inflammation..

Transfer Immune Factors - Researched Nutritionals: Transfer Immune Factors are a go-to for immune dysregulation and MCAS, especially in cases involving long-COVID, mold exposure, or Lyme and co-infections. Rather than suppressing symptoms, they help retrain immune communication, calm overactive inflammatory signaling, and improve immune tolerance — making them especially helpful for sensitive, reactive nervous and immune systems.

Phosphatidylcholine - Body Bio: a foundational cell-membrane and nervous-system stabilizer. It helps repair and protect cell membranes, calm inflammatory signaling, and support healthy immune tolerance. In MCAS and post-infectious states, mast cells and immune cells often have “leaky,” unstable membranes — PC helps quiet reactivity at the cell level, rather than forcing the immune system to act differently.

Important! Educational only. This content is not medical advice. Always work with a qualified healthcare provider before changing medications, supplements, or treatment plans.