Three Brains, One Healing Conversation: Understanding the Nervous System and MS

After twenty-five years in clinical practice, and about a decade of watching this area of science evolve, I have started to think about the nervous system a little differently.

Most of us grow up thinking we have one brain. The brain inside our skull is the command center, making decisions and telling the rest of the body what to do.

But the reality is much more interesting.

Your brain, gut, and heart are part of an extraordinary communication network. They are constantly exchanging information through nerves, hormones, immune signals, and the autonomic nervous system.

I sometimes describe this as three brains, one conversation.

That phrase does not mean your gut or heart is literally another brain in the same sense as your brain and spinal cord. Rather, each contains extensive neural networks and plays an important role in communicating with and regulating the rest of your body.

Once you begin to understand this conversation, it can change the way you think about your nervous system, your body, and your health.

And when you are living with a complex condition such as multiple sclerosis, that understanding can become particularly meaningful.

No single drug, supplement combination, diet, breathing exercise, or magic solution will make MS disappear. Living with MS is complicated, and every person's experience can look different.

That is precisely why I believe learning to listen to your body matters.

The more connected we become to what our bodies are telling us, the better we may understand our own needs, our limitations, our strengths, and what we are capable of engaging in ourselves.

That is not about having complete control.

It is about having agency.

Your Nervous System Isn't Just in Your Head

When we hear the words nervous system, most of us picture the brain and spinal cord.

That is the central nervous system, and it is incredibly important. It receives information, processes it, and coordinates responses throughout the body.

But that picture is incomplete.

Your nervous system extends throughout your body. It is constantly receiving information from your organs, tissues, muscles, and environment.

Your body is not simply waiting for your brain to give it instructions.

It is communicating back.

All the time.

Your Brain and Spinal Cord

Your central nervous system is continuously gathering information about what is happening both inside and outside your body.

Are you safe?

Is there something you need to respond to?

Do you need to become more alert?

Is it time to rest?

Much of this happens automatically, before you consciously understand what is going on.

Think about walking through a dark parking lot at night and suddenly hearing a noise behind you.

Before you have identified the sound, your attention changes.

Your heart may beat faster.

Your breathing may change.

Your muscles may tense.

Your body may become more alert.

Only afterward does your conscious mind have a chance to say, “What was that?”

That is not mystical.

It is physiology.

This is also one reason simple grounding practices can sometimes be useful. Bringing your attention to what you can see, hear, and feel in the present moment can help you reconnect with what is actually happening around you.

It is a small practice, but sometimes small things can help us feel more connected to the body we are living in

Your Gut: The Enteric Nervous System

You have probably heard the gut described as the second brain.

There is a reason for that.

Your digestive tract contains an extensive network of neurons called the enteric nervous system. This system can coordinate many aspects of digestion independently while also communicating continuously with the brain.

And that communication goes in both directions.

Your brain can influence your gut, and signals from your gut can travel back toward the brain through neural, hormonal, metabolic, and immune pathways.

This larger communication network is often referred to as the gut-brain axis.

Your gut microbiome is also part of this bigger picture. The microorganisms living throughout your digestive tract interact with your immune and metabolic systems and can influence signaling throughout the body.

That does not mean every sensation in your stomach is a message you should automatically trust.

It means your gut is not separate from the rest of you.

It is participating in the conversation.

Your Heart Is More Than a Pump

The heart is another fascinating participant in this communication network.

The heart contains its own intrinsic nervous system and constantly sends information to the brain about its rhythm and physiological state.

At the same time, the brain influences the heart through the autonomic nervous system.

Think about what happens when something suddenly frightens you.

Your heart may start beating faster.

Your breathing changes.

Your muscles prepare to respond.

Your digestive system may temporarily become less of a priority.

And this can happen before you have consciously thought, “I am scared.”

Your nervous system has already begun responding.

It is doing exactly what it was designed to do by coordinating information throughout your body as quickly as possible.

The Vagus Nerve and the Body-Brain Connection

If the brain, gut, and heart are constantly communicating, how does some of that communication happen?

One important pathway is the vagus nerve.

The vagus nerve is a major part of the parasympathetic nervous system and connects the brain with several organs, including the heart and digestive tract.

One particularly interesting aspect of the vagus nerve is that much of the information it carries travels from the body toward the brain.

That matters because we often imagine communication as something that starts in the brain.

The brain gives instructions.

The body follows them.

But that is only half of the story.

The brain is also receiving an enormous amount of information from the body.

Your body is constantly reporting back.

It is a conversation. Three brains, one conversation, and it has been happening since before you had words for any of it.

You've Been Listening to This Conversation Your Whole Life

Think about the last time you had a gut feeling about something.

Maybe your heart seemed to drop when you received unexpected news.

Maybe you noticed your breathing become shallow during a stressful conversation.

Maybe you felt tension in your shoulders before you even realized you were worried.

These experiences do not mean that every physical sensation is an accurate prediction or that every intuition should be followed.

But they do tell us something important.

Your brain is constantly receiving information from your body.

Sometimes your body responds before your conscious mind has found the words to describe what is happening.

That is part of being human.

Why the Nervous System Matters When You're Living With MS

This becomes especially important when we talk about multiple sclerosis and the nervous system.

MS is a complex neurological disease involving the immune system and central nervous system. Managing MS often involves medical treatment, monitoring, symptom management, lifestyle considerations, and ongoing conversations with healthcare professionals.

There is no simple formula for living with MS.

There is no drug, supplement combination, breathing technique, or magic fix that makes the condition disappear.

And it is important to say this clearly because people living with MS deserve compassion, not another message suggesting that they simply need to try harder or regulate their nervous system better.

Nervous system regulation does not cure MS.

Stress does not cause MS.

And your symptoms are not your fault.

At the same time, your nervous system does exist within the larger environment of your body.

Sleep matters.

Movement matters.

Stress matters.

Relationships matter.

Emotional wellbeing matters.

Breathing matters.

And your ability to notice what your body is telling you matters too.

These things do not replace appropriate medical care.

They are part of the larger picture of caring for yourself.

Listening to Your Body Can Create Agency

For me, this is one of the most important pieces of the conversation.

When you are given a diagnosis like MS, it can be easy to feel as though your body has suddenly become something that happens to you.

Appointments happen.

Tests happen.

Symptoms happen.

Treatment decisions happen.

Sometimes it can feel as though everyone else is talking about your body while you are standing somewhere outside of the conversation.

But you are still living inside that body.

You know things about it that no test can completely capture.

You may notice that you need more rest after certain activities.

You may notice patterns in your energy.

You may notice how stress affects your sleep or how your breathing changes when you feel overwhelmed.

You may discover that certain forms of movement feel supportive while others leave you depleted.

None of these observations should replace medical assessment.

But they can help you become a more informed participant in your own healthcare.

That is where agency can begin.

Not with the idea that you can control everything.

You cannot.

But with the understanding that you can become more curious about your own experience.

Stress and Nervous System Regulation

When stress becomes chronic, the body can spend more time in a state of heightened physiological arousal.

Learning ways to support nervous system regulation may help with overall wellbeing, sleep, emotional resilience, and the body's ability to move between activation and recovery.

For someone living with MS, these practices can be part of a broader approach to health alongside appropriate medical care.

That distinction is important.

Alongside, not instead of.

There is a lot of pressure in the wellness world to find the perfect protocol.

The perfect supplement.

The perfect diet.

The perfect routine.

But sometimes the more useful question is much simpler.

What is my body telling me right now?

Am I tired?

Am I overwhelmed?

Am I holding my breath?

Do I need movement?

Do I need rest?

Do I need connection?

Do I need to speak with my healthcare team about something that has changed?

Learning to ask those questions can be powerful.

Your Breath: A Simple Way to Work With Your Nervous System

Of all the ways we can begin paying attention to the nervous system, I keep coming back to something wonderfully simple.

Your breath.

You do not need a device.

You do not need an expensive appointment.

You do not need a supplement.

You have been carrying this tool with you your entire life.

Slow, comfortable breathing can influence autonomic nervous system activity, and breathing patterns are closely connected with heart rate and other physiological processes.

One simple practice is to make your exhale slightly longer than your inhale.

For example:

Inhale for 4 seconds.

Exhale for 6 seconds.

There is no need to force the breath or make it unusually deep.

Simply allow yourself to slow down and create a little more space between one breath and the next.

And if counting makes you uncomfortable, forget the numbers.

Just breathe gently.

Sometimes the goal is not to do the exercise perfectly.

Sometimes the goal is simply to notice that you are breathing.

What Is HRV and Why Does It Matter?

You may have come across heart rate variability, or HRV, if you use a smartwatch or fitness tracker.

HRV is different from your heart rate.

Instead, it refers to the variation in timing between individual heartbeats.

That variation is normal.

In fact, a healthy nervous system needs flexibility. Your heart rate naturally changes in response to breathing, movement, emotions, posture, sleep, stress, and many other factors.

Higher HRV is not automatically better, and one HRV measurement should never be treated as a diagnosis.

However, HRV can provide one window into how the autonomic nervous system is responding and adapting.

Breathing is one of the simplest ways to influence the relationship between the heart and brain in real time.

More importantly, paying attention to these signals can help you become more aware of your own patterns.

That awareness is valuable.

The Bigger Picture: Healing as Participation

This is ultimately what I hope you take from the idea of three brains and one conversation.

Your brain, gut, heart, and the rest of your nervous system are not operating independently.

They are communicating constantly.

The conversation is already happening.

The question is whether we can learn to listen.

Can you notice what happens to your breathing when you become stressed?

Can you recognize when your body is asking for rest?

Can you notice how your gut responds to certain situations?

Can you recognize when you are becoming overwhelmed?

Can you learn the difference between pushing through because you genuinely want to and pushing through because you feel you have to?

These observations are not a substitute for medical evaluation.

They are an invitation to become more connected to the body you are living in.

And that connection can be especially meaningful when living with a complex condition like MS.

Living Beyond the Diagnosis

Living beyond an MS diagnosis does not mean ignoring MS.

It does not mean pretending the diagnosis does not exist.

It does not mean rejecting medication or trying to heal yourself instead of working with your healthcare team.

And it certainly does not mean believing that you can think, breathe, or supplement your way out of a neurological disease.

It means remembering that you are more than your diagnosis.

You are a whole person living in a whole body.

Your medical treatment matters.

Your relationships matter.

Your sleep matters.

Your movement matters.

Your stress response matters.

Your breath matters.

And the way you listen to yourself matters too.

The more we learn to connect with our bodies, the more information we have about what supports us, what challenges us, and what we may be capable of engaging in ourselves.

That does not give us complete control.

But it can give us something that matters deeply.

Agency.

Maybe healing is not always about finding one thing that fixes everything.

Maybe sometimes it is about becoming a better listener.

Listening to the body.

Listening to the nervous system.

Listening to the signals that have been there all along.

And remembering that even when you cannot control everything your body is going through, you can still participate in the conversation.

Frequently Asked Questions

What are the three brains?

The phrase “three brains” is a useful way of describing the interconnected roles of the brain, gut, and heart in regulating and communicating information throughout the body. The gut contains the enteric nervous system, while the heart also contains an intrinsic network of neurons. They communicate continuously with the brain through neural, hormonal, and other physiological pathways

How does the nervous system affect multiple sclerosis?

The nervous system is central to MS because multiple sclerosis is a disease of the central nervous system. Beyond the disease itself, factors such as stress, sleep, breathing, and autonomic nervous system activity can influence how the body responds and adapts. Nervous system regulation may support overall well-being alongside appropriate MS treatment, but it does not replace medical care.

What is the gut-brain connection in multiple sclerosis?

The gut and brain communicate through what is known as the gut-brain axis, involving neural, immune, hormonal, metabolic, and microbial signals. Because MS involves immune and nervous system processes, researchers are increasingly interested in how the gut microbiome and gut-brain communication may relate to MS. However, this is an evolving area of research and should not be interpreted as evidence that gut health alone can treat or cure MS.

Can stress make MS symptoms worse?

Stress does not cause multiple sclerosis, but ongoing stress can affect sleep, energy, mood, muscle tension, and other aspects of health that may influence how someone experiences their symptoms. Learning healthy ways to manage stress may therefore be a valuable part of living well with MS, alongside treatment from your healthcare team.

How does the vagus nerve connect the brain, heart, and gut?

The vagus nerve is a major communication pathway between the brain and several organs, including the heart and digestive tract. It carries information in both directions, allowing the brain to receive information about the body's internal state while also influencing organ function. This constant communication is one reason the nervous system is better understood as a network rather than a one-way command system.

Can slow breathing help regulate the nervous system?

Slow, comfortable breathing can influence autonomic nervous system activity and the interaction between breathing, heart rate, and the brain. Practices that emphasize a gentle, slightly longer exhale may promote relaxation and physiological regulation for some people. Breathing exercises are supportive practices, however, and are not a treatment or cure for MS.

What does HRV tell you about your nervous system?

Heart rate variability (HRV) measures the natural variation in timing between heartbeats. It can provide one window into autonomic nervous system activity and the body's ability to adapt to changing demands. HRV naturally varies between individuals and can be affected by sleep, stress, illness, fitness, medications, and other factors, so one reading should not be interpreted on its own.

Why does the body send information to the brain through the vagus nerve?

The brain needs continuous information about what is happening inside the body. Signals carried through pathways including the vagus nerve help the brain monitor aspects of organ function and the body's internal environment. This helps explain why physical sensations such as changes in heart rate, breathing, or gut activity can influence how we feel and respond before we consciously understand what is happening.

Can nervous system regulation help someone live beyond an MS diagnosis?

Nervous system regulation cannot eliminate an MS diagnosis, but practices such as mindful breathing, stress management, adequate sleep, movement, and body awareness may support overall well-being and help someone feel more actively involved in their health. Living beyond the diagnosis isn't about ignoring MS—it is about recognizing that medical treatment is only one part of a much larger healing journey.