Hello again Mast Cell 360 community!
Kam and the MC360 team here. Over the last two emails, we’ve covered some of what shapes your nervous system’s baseline and how it’s in constant conversation with your mast cells.
And we talked about how your nervous system and mast cells are both capable of sending signals that prime the other toward reaction or calm.
Today, we’ll chat about the three specific areas of your nervous system that need to be worked on together for the best results.
Because when people focus on only one, they often plateau, get frustrated, or assume nervous system work “doesn’t work for them.”
PS. If you want to learn more on this topic, don’t miss our ** FREE live training** on Monday, September 21 at 12:00 PM ET. Plus, a
It’s usually not that it doesn’t work. It’s often that only a third (or less) of the system gets addressed. And that’s kind of like trying to fix a 3-legged stool by only repairing one leg.
Or there are other things that need support along the way, like your mast cells.
In this post, you’ll learn:
The three areas nervous system work needs to address
A little about each of these 3 areas
The role of mast cells in this loop
A real example of these three parts recovering together
Where to start if you want support across all three nervous system areas, plus mast cell calming support for sensitive people
Let’s get into it, starting with something you’ll probably recognize right away.
This post is for informational purposes only. To read our full disclaimer, please scroll to the bottom of this post.
Honestly, if you’re a breathing human being in today’s world, nervous system support is a good tool to have. Things move fast, demands are constant, and regular support is good maintenance for anyone.
But if you have a chronic illness, this work isn’t optional. It can be one of the most important pieces of healing, and skipping it can make progress difficult, sometimes even impossible.
Here’s how that works when you have Mast Cell Activation Syndrome.
**Your mast cells and your nervous system are in a loop, each one responding to the other. A dysregulated nervous system makes mast cells more reactive, and reactive mast cells send your nervous system more signals to respond to. **
That’s why we’re looking at all three nervous system areas today, and why nervous system work and mast cell support matter together for real stabilization.
You might already recognize some of this nervous system dysregulation playing out without ever having put a name to it. Have you ever:
Jumped at a sound that didn’t seem to bother anyone else in the room
Struggled to tolerate a hug, a scratchy tag, or a certain fabric
Felt completely wired after a totally normal conversation
Come home exhausted from a trip to a busy grocery store
Dealt with fatigue that doesn’t match what you actually did that day
Felt anxious with no clear reason why
Seemed to react to everything
**Many people chalk these up to being “sensitive,” just how they are, or the lingering effect of one event that tipped things over. **
But as we covered in part 2 of this series, your nervous system and mast cells sit close enough to talk directly. When one is dysregulated, it nudges the other toward more reactivity, and symptoms can show up across many body systems, often in ways that don’t seem connected at all.
You might recognize some of these without knowing they can be nervous system (or mast cell) related:
Neurological & Sensory
Exaggerated startle response
Sensitivity to light, sound, smell, or touch
Weak or overly strong gag reflex
Tingling or buzzing sensations
Digestive
Constipation or diarrhea
Nausea
Cardiovascular
Blood pressure swings
Palpitations or irregular heartbeat
Fainting or near-fainting
Cognitive
Brain fog
Memory or concentration difficulties
Sleep
Difficulty falling or staying asleep
Frequent waking
Energy
Fatigue that doesn’t resolve with rest
Fatigue that impacts daily life
Unusual exhaustion from small tasks
Mood & Regulation
Anxiety or depression
Trouble relaxing
Feeling wired after normal activity
Difficulty handling change
Supporting your nervous system directly can make a real difference in how you feel and function, including calming your mast cells.
Let’s take a closer look at the three nervous system areas you’ll want to support — the limbic system, autonomic balance, and vagal tone.
One quick note first. For some people, there’s a physical or structural issue underneath symptoms. This can be things like craniocervical instability (neck vertebrae that don’t align right) or vascular compression (pinched or pressed veins) that need their own dedicated care. There can be other contributors, too.
Working on everything below can genuinely help your nervous system work better, but it’s not a substitute for structural care when it’s needed. Structural issues can be worth exploring with a knowledgeable practitioner, especially if you’ve done nervous system work and it hasn’t made much difference.
But sometimes, we see people focus on one area and skip others. And that can keep you feeling stuck, too.
Let’s take a look at the three parts of your nervous system you’ll want to consider when you do nervous system work.
Your limbic system is the part of your brain that handles threat detection and emotions. Its key structures include the:
Amygdala (your alarm bell)
Hippocampus (your memory keeper)
Hypothalamus (the switchboard that sets off your body’s stress response)
Its job is to constantly answer one question: is this safe, or not?
In a well-regulated system, that answer is accurate most of the time. But after trauma, or years of genuine threat signals from your body (mold, infections, flares), your limbic system can start answering “not safe” to things that are safe.
Here’s why. Pain and other alarming signals are supposed to get your attention, that part is built in for everyone. But when a threat keeps showing up repeatedly, the way it does with chronic illness or ongoing pain, your brain treats that as a lesson.
**It starts linking “body sensation” to “danger,” and lowers the threshold it needs to sound the alarm so it can respond faster next time. Repetition also makes those connections and pathways in your brain much more ingrained. **
Your brain forms pathways when you repeat things. This is how you learn to do things and how your body learns to keep you safe. The problem with hypersensitivity is that the adaptation and response outlast the original threat.
Over time even small, harmless sensations start being interpreted as a threat automatically and sounding the alarm too quickly.
It’s called interoceptive hypervigilance in research. It means your brain and nervous system aren’t just receiving more information, they are actively anticipating threat before it arrives. Your brain has trained itself to expect it.
This isn’t something you’re doing wrong or a flaw. It’s a biological pattern.
And that might sound discouraging, but it’s actually good news, because when something can be trained, it means you can untrain it too.
The good news is that the same mechanism works in reverse. Just as repetition ingrained those threat pathways, consistent repetition of safety signals can gradually build new ones. That is exactly what limbic retraining is designed to do.
Tools for limbic system rewiring or retraining are things like:
Gupta
DNRS
And others
This is your autonomic nervous system (ANS), the system that runs largely on autopilot, regulating things like heart rate, digestion, and your stress response. Your sympathetic and parasympathetic systems are the two main branches of it.
Your sympathetic system is your fight, flight, or freeze state.
Your parasympathetic system is your rest, digest, and heal state.
Neither state is bad. You need both to function. But you want them in balance.
A well-regulated nervous system moves between the two as needed.
A dysregulated one gets stuck. Usually in sympathetic dominance. But also sometimes in a shutdown, burnt-out state where even the sympathetic system can’t fully engage when there’s an actual threat.
As we covered in part 2 of this series, your body reads ongoing inflammation as a threat. Which pushes you further into sympathetic dominance, and chronic mast cell degranulation (the release of chemical messengers) adds to that. Meaning resources you could be using to heal are being used for staying alert and ready instead. And it becomes a loop.
This is part of why it’s so important to work on your nervous system and your mast cells together.
**This piece of the work is about building tools into your daily life that support that balance. **
A few examples are:
Movement matched to your state— gentle stretching or slowing down when you feel wired and stuck in sympathetic overdrive. A short walk or a few minutes outside when you’re in a shutdown state and need to gently re-engage.A brief cool splash— something gentle and cool on your forehead or wrists can interrupt a sympathetic spike by triggering a built-in calming reflex. This is not the same as an ice bath or cold plunge, which can be too much for sensitive systems.Co-regulation— calm, low-demand time with a person, pet, or environment that genuinely feels safe to you.Orienting— using your senses to softly connect to your immediate environment. Slowly looking around the room and naming colors, for example. These kinds of exercises send your nervous system the signal that you are safe right now.
As we covered earlier in this series, your vagus nerve releases chemicals that calm your mast cells and reduce inflammation. Communicating top-down from brain to body.
**But most of its job actually runs the other direction. Your gut, heart, and lungs are constantly sending information upward to your brainstem. Thousands of small signals a day about what’s happening inside you. **
Your brain uses that stream of information to decide, moment to moment, whether you are safe.
When those signals have been leaning toward danger for years, the system doesn’t just switch back the moment things get a little quieter. It’s been trained by repetition. And it takes repetition to retrain.
The shift happens when your body has gathered enough consistent, repeated evidence that it’s actually safe now.
This is where working on your vagal tone comes in. Your nervous system’s ability to send and receive those calming signals effectively is important.
Practices like breathwork, somatic movement, and vagal exercises all send your body repeated safety signals directly. What your brainstem has learned to expect gets updated slowly, through consistent practice over time.
There’s a study that shows how these three areas interact, and it involves mast cells.
**Researchers found that when gut mast cells were overactive in mice, it increased vagal nerve signaling. **That signal altered stress-hormone activity specifically in the amygdala (the brain’s alarm center) producing anxiety-like behavior.
When they gave a mast cell stabilizer, the vagal overactivity reduced and the anxiety-like behavior came back down.
Mast cells affected the vagus nerve. The vagus nerve affected the limbic system. The limbic system shaped the emotional and behavioral outcome. They are all connected.
Here’s how each piece maps to the three areas we covered:
The gut mast cells communicated upward through the vagus nerve — that’s the vagal signaling piece.
The signal landed in the amygdala and altered stress hormone activity there — that’s the limbic system piece.
And the anxiety-like behavior that followed was a sympathetic response, the alarm going off and the body mobilizing — that’s the autonomic balance piece.
This matters for Mast Cell Activation Syndrome (MCAS) because part of what drives ongoing reactivity is a nervous system that has learned, through repetition, to treat ordinary things as threats.
Research also shows that adding vagus nerve stimulation to the retraining process brings faster results.
In one study, it took just 1 session to get the same results that normally took 5. It worked by directly strengthening the brain pathway responsible for learning that something once felt dangerous is actually safe.
So vagal work can both help calm mast cells and retrain signaling. And it may also increase the speed at which retraining happens.
Limbic patterns can be retrained.
Sympathetic and parasympathetic balance can be rebuilt.
Vagal signaling can be strengthened. And doing so can help the other two.
And while this helps calm mast cells, using mast cell stabilizing supports can also make the nervous system work easier!
It takes consistent work but the capacity for change is real. At any age. At any point in your healing journey.
And it doesn’t have to be complicated to start. A few minutes a day makes a difference. One first step towards stabilizing mast cells helps.
As you’ve seen throughout this series, calming your mast cells helps the nervous system settle, and vice versa. This work supports itself in both directions.
**We know figuring out where to start can feel overwhelming. **
We also know that costs add up and finding real help with something this complex isn’t easy.
We hope this series has made one thing clearer: your nervous system and your mast cells aren’t separate problems. They are part of the same conversation. And that’s why we’ve always recommended working on both together.
Want to go deeper? Join our FREE live training - Your Nervous System & Mast Cells: The Basics of Connection & Healing with MCAS
📅 Monday, September 21
🕛12:00 PM ET / 9:00 AM PT
We’ll cover:
How these two systems work together
The most common things people miss
Why we start here with nearly every client, no matter how complex their case
Getting started with small steps
If you’ve tried supplements that backfired, tried nervous system work that “didn’t work,” or you are just tired of guessing, this was created for you.
🎁Everyone who joins live will also be entered to win one of three Autumn MCAS Reset Bundles ($524 value each).
See you soon!
Together in healing,Kam, MC360 Health Coach, and the MC360 Team
Berntson, G. G., & Khalsa, S. S. (2021). Neural circuits of interoception. Trends in Neurosciences. https://doi.org/10.1016/j.tins.2020.09.011
Cordner, Z. A., Marshall, A. T., Serrano, D. R., Milton, L. K., & Moran, T. H. (2021). Vagal gut-brain signaling mediates amygdaloid plasticity, affect, and pain in a functional dyspepsia model. JCI Insight. https://doi.org/10.1172/jci.insight.144046
Klein, A. S., Dolensek, N., Weiand, C., & Gogolla, N. (2021). Fear balance is maintained by bodily feedback to the insular cortex in mice. Science. https://doi.org/10.1126/science.abj8817
Krieger, J.-P., et al. (2022). Neural pathway for gut feelings: Vagal interoceptive feedback from the gastrointestinal tract is a critical modulator of anxiety-like behavior. Biological Psychiatry. [https://doi.org/10.1016/j.biopsych.2022…
