When I Learned My Random Symptoms Had a Name
Why Symptoms Can Feel So Unpredictable—and What Your Body May Be Doing
My face was on fire
—red, hot, and burning.
My head felt like it was under pressure, pounding from the inside out. My stomach was starting to cramp and turn at the same time.
And all I could think was:
Why is this happening again? It was so sudden.
Just a few minutes earlier, I had been sitting in a clinic for an appointment. The room had plug-in air fresheners, but at first I thought I was okay.
Nothing felt dramatic in the moment.
But as I started talking to the clinician and explaining how hard things had been lately, I felt it begin—slow at first. My face warming. My body shifting. That familiar wave building underneath the surface.
And then it all came crashing in.
Flushing. Pressure. Pain. Stress.
It wasn’t gradual. It wasn’t predictable. It was like my body had flipped a switch.
And what made it even more confusing was that nothing about the situation seemed “extreme enough” to explain what my body was doing.
I wasn’t doing anything different than I had done before.
So why was my body reacting like this?
Why I’m Writing This
This kind of experience is exactly why I’m writing this.
So many of my clients come to me completely unaware that MCAS might even be part of what they’re experiencing. They’re often dealing with confusing, multi-system symptoms that don’t seem to fit neatly into one diagnosis, and they’ve been left without clear language to describe what’s happening in their bodies.
My hope is that putting more accessible information out there helps reduce that confusion. Not to diagnose anyone—but to offer language, awareness, and a starting point for curiosity instead of self-doubt.
Because when you don’t have a framework for what your body is doing, it can feel random, scary, or even like you’re imagining things.
And I don’t want people to stay stuck in that place.
When I stumbled upon a podcast episode of Decoded | Unlock The Secrets of Human Behavior, Emotion and Motivation, I felt like the host did an excellent job breaking down the biological mechanism in a way that was structured and easy to follow.
Hearing it explained so clearly helped me realize this would be the perfect opportunity to bring together two things: my own lived experience with MCAS, and a simple way to understand what is actually happening in the body when these symptoms show up.
My First Experience Being Evaluated for MCAS
I first learned about MCAS (mast cell activation syndrome) when I was being seen at the Vanderbilt autonomic hub. My physician referred me to an allergist because of the cluster of symptoms I was experiencing.
When I met with him, he told me he suspected MCAS. This was around 2010—before MCAS was widely recognized or clearly understood in mainstream medicine. Even today, it’s still an evolving and often misunderstood condition, but at that time the terminology itself was much less defined, and MCAS and MCAD were still commonly used interchangeably.
He sent me home with a 24-hour urine collection kit and asked me to wait until I was actively symptomatic before starting the test.
I wasn’t exactly eager to do it—but I followed through.
I remember being in a hotel room when I began experiencing symptoms again, especially flushing, which was one of my most consistent and noticeable reactions. That became the window where I completed the 24-hour collection.
When the results came back, my methylhistamine levels were significantly elevated. I also had a positive tryptase blood test.
That was one of the first moments I had biochemical confirmation that what I was experiencing was real and measurable—not just random, unexplained symptoms.
How I’ve Come to Understand MCAS in My Own Body
One of the simplest ways I explain MCAS is through the “bucket” analogy.
We all have an internal threshold—like a bucket—that represents how much stress, exposure, and internal load our body can handle at any given time.
In someone without mast cell dysfunction, that bucket fills, but it also empties efficiently.
With MCAS, it’s different.
The bucket may:
fill more quickly and be overall smaller
empty less efficiently
and reach overflow without clear warning
And when it overflows—that’s when symptoms appear.
What makes this so confusing is that the overflow doesn’t always match a single obvious trigger.
It can feel like:
“I didn’t do anything differently”
“Why is this happening now?”
“This doesn’t make sense compared to yesterday”
But underneath that experience is often a cumulative load reaching a threshold.
What MCAS Is (From a Biological Perspective)
In the podcast episode, MCAS is explained as a condition where mast cells—immune “lookouts” located throughout the body in places like the skin, gut, lungs, blood vessels, and even near the brain—become overly reactive.
When triggered, they release chemical mediators such as histamine and cytokines that affect multiple systems at once.
These releases don’t happen in a steady, predictable way. Instead, they often occur in surges, followed by periods of relative calm.
As described in the episode:
“The reason MCAS feels so unpredictable is that these mediators are released in surges. So they're not consistent in a steady flow. There's a big surge and then it will shut down.”
This is why symptoms can feel episodic—coming on strongly, affecting multiple systems at once, and then temporarily resolving.
Why Symptoms Can Look So Different From Person to Person
Histamine and other mast cell mediators affect many systems in the body, including:
Skin (flushing, hives, itching)
Gut (bloating, diarrhea)
Cardiovascular system (palpitations, lightheadedness)
Nervous system (brain fog, anxiety-like symptoms)
Respiratory system (wheezing, congestion)
Because of this wide reach, MCAS can look very different depending on:
which systems are most sensitive
what triggers are present
and what the total “load” is at the time
This is also why it can sometimes be mistaken for other conditions, including hormonal or mental health disorders.
Why MCAS Can Affect Mood and Mental Clarity
One of the most important pieces of MCAS that is often overlooked is its connection to brain function.
Histamine is not just involved in allergic responses—it also plays a role in:
alertness
focus
mood regulation
sleep cycles
When histamine and inflammatory mediators become elevated, they can influence brain signaling pathways and neurotransmitters.
This can result in experiences that may look like:
anxiety
panic sensations
mood instability
brain fog
depressive symptoms
Not because these experiences are “just psychological,” but because the immune system and nervous system are deeply interconnected.
The episode also references psychoneuroimmunology, the study of how the immune system and brain communicate through chemical messengers like cytokines.
The Feedback Loop Between Stress and Mast Cells
One of the most important concepts in MCAS is that it is not a one-directional process.
The podcast explains that there is often a feedback loop:
Stress can increase mast cell sensitivity
Activated mast cells release inflammatory mediators
These mediators increase stress signaling in the brain
Increased stress further activates mast cells
This creates a cycle where both systems reinforce each other.
This is why it can become difficult to identify a clear “starting point”—because both emotional state and physiological response are influencing one another simultaneously.
My Current Perspective on MCAS
From my lived experience, MCAS stopped feeling like a collection of random symptoms once I began to understand it as a threshold-based system.
Using the bucket analogy, the focus becomes less about fear of symptoms and more about awareness of load.
This includes things like:
dietary histamine load
environmental exposures (fragrance, pollen, chemicals)
stress and nervous system activation
overall physiological resilience
The goal is not perfection—it’s awareness.
Awareness of what fills the bucket… and what supports the body in maintaining balance before overflow occurs.
Final Thoughts
What has helped me most in understanding MCAS is realizing that my body was not unpredictable—it was responsive.
The challenge wasn’t that there was no pattern.
It was that I hadn’t yet been taught how to see it.
And once you begin to understand that your symptoms are part of a system—not random events—it changes how you relate to your body entirely.
You move from confusion…
to curiosity…
and eventually, to clarity.
And that shift changes everything.
In my next blog, I’ll share what I’ve personally tried to manage MCAS over the years—including H1 and H2 blockers, cromolyn, ketotifen, and Xolair—and what I noticed along the way. I’ll also walk through what ultimately made the biggest difference for me, including how I began to support my body through a more root-cause and homeopathic approach.
