Why Your Nervous System Keeps Firing — The Stoic View

Stoicism and the nervous system connect at the level of appraisal: the moment between an event and a response, where the mind decides whether something is a threat. The stress response follows from that decision. Change the appraisal, and the cascade changes with it. That is the bridge Stoic philosophy builds, one that the wellness world has been approaching from the other direction for decades.

The wellness world gave you good tools. You track your heart rate variability. You run breathing exercises before the difficult conversation. Cold exposure, somatic practices, maybe journaling: these all sit in the toolkit. You know what the vagus nerve does. Intellectually, you understand that the stress response evolved to outrun predators and not to survive Tuesday morning emails.

And yet. The same situations keep triggering the same reactions. The same person, the same type of comment, the same feeling of things slipping out of your hands, and there it is again: the tightening, the heat, the spiral.

What is actually happening in your body

Your nervous system runs the communication network for everything, from your heartbeat to your thoughts. The relevant part here is the autonomic nervous system, which governs involuntary functions: heart rate, digestion, perspiration, pupil size, and hormone secretion. The name “autonomic” came from an early belief that it operated independently of the brain. We now know that is not quite right, and that nuance matters for what follows.

The autonomic nervous system runs two main modes. The first is the parasympathetic state: heart rate slows, digestion activates, the mind thinks clearly. This is the rest-and-digest mode, the baseline the body returns to when no threat has been detected. The second is the sympathetic state, which the brain activates when it perceives a threat. The body redirects every available resource toward one goal: surviving what is coming. Pupils dilate, peripheral arteries constrict to push blood to the muscles, epinephrine raises blood sugar, digestion halts. This is the fight-or-flight response, and it is not a malfunction. Evolution designed it brilliantly, and it kept our ancestors alive.

The problem is that it cannot tell the difference between a lion and a passive-aggressive message from a colleague. Both fire the same cascade. And once that cascade starts, something else happens too: the prefrontal cortex, the seat of deliberate reflective thinking, goes partially offline. Psychologist Daniel Kahneman described two modes of thinking: System 1, fast and automatic, and System 2, slow and deliberate. Sympathetic activation forces System 1 into the driver’s seat. You become reactive rather than reflective, and no amount of rationalising stops that mid-flow.

That is why breathwork and cold exposure work. They operate at the body level, below language, below thought. They speak the nervous system’s own language. But here is what the wellness world rarely asks: what fired the signal in the first place?

Why is it called sympathetic?

The name itself tells a story. Sympathetic comes from the Greek sympatheia, meaning “feeling together,” “interconnected,” or “suffering with.” Early anatomists noticed that this system did not affect one organ at a time. Everything moved together: pupils dilating, heart racing, digestion halting, muscles tensing, all at once. The organs were, in a sense, sympathising with each other.

There is a quiet irony in that for anyone studying Stoicism. The sympathetic nervous system, named for solidarity and shared feeling, is precisely the system that fires when we over-identify with things outside our control. The Stoics were, in their own way, training us to be a little less sympathetic in the original Greek sense.

The thing that triggers the trigger

In the 1980s, psychologist Richard Lazarus developed what is now called stress appraisal theory. The core insight was deceptively simple: stress is not the event. Stress is how we evaluate the event, whether we judge it as threatening or beyond our resources to handle.

The nervous system does not respond to reality. It responds to your interpretation of reality. This is why two people can receive the same critical piece of feedback and one shrugs and gets curious while the other spirals for three days. Same words, different appraisal, completely different physiological response. The amygdala, the part of the brain that sounds the alarm, responds to a perceived threat, not a measured one.

Which means the real lever, the upstream one, is not the breath. It is the moment of interpretation that happens before the breath becomes necessary.

What the Stoics were doing 2,000 years ago

Around 300 BCE, a group of philosophers in Athens, and later in Rome, began working on a problem that sounds remarkably familiar. Why do people suffer when circumstances do not warrant it? Why do some people remain steady in situations that unravel others? Where exactly does the disturbance come from?

The Stoics, Epictetus, Marcus Aurelius, and Seneca, concluded that the disturbance never comes from events themselves. We create it through the judgments we attach to events. They called the raw input, the initial impression of something happening, a phantasia, or impression. Almost always, we add something to it: a story, a meaning, a catastrophe.

This is not a platitude. It is a precise psychological observation that predates modern appraisal theory by twenty centuries.

The discipline of assent: what to do with the pause

The Stoics went further than noticing this. They built a practice around it, starting from an admission that makes their philosophy feel surprisingly honest: they acknowledged that the first physical reaction is not yours to control.

Seneca made this explicit in a letter to his friend Lucilius:

He described the steadiest public speakers sweating before a crowd, knees trembling, teeth chattering. He noted that even the most dignified men blush without warning:

The Stoics had a technical term for these involuntary first reactions: propatheiai, sometimes translated as pre-passions or fore-passions. Crucially, they did not consider them emotions proper, because no assent had been given yet. The body moves; that is nature doing what nature does. What comes next is a different matter entirely.

A Stoic aboard

Aulus Gellius, a Roman writer who documented Stoic teaching in the second century, captured this vividly. In his Attic Nights, he describes a storm at sea with a Stoic philosopher aboard. The philosopher goes visibly pale. Passengers challenge him afterwards: should a Stoic not remain unmoved? The philosopher calmly reaches for a book by Epictetus and reads the doctrine aloud. The pallor was a first motion, involuntary, beyond any training to prevent. But at no point did he assent to the impression that the situation was catastrophic. The body did what the body does. The mind held its own course. (Aulus Gellius, Attic Nights, 19.1)

This is where the Stoic practice begins. Between the impression and the response, there is a moment, a gap however small, where you have not yet agreed with what the impression is telling you. The Stoics called the act of agreeing with an impression assent. They taught that assent is always, at least in principle, a choice.

When your phone lights up with a message from someone who tends to put you on edge, before you have even read it, the familiar contraction may already arrive. The autonomic nervous system has received an impression and starts preparing a response. Your System 1 is already running the story. The Stoic practice of assent says: wait. Do not agree yet. Look at the impression before accepting it as accurate.

Is it actually dangerous?

Is this actually dangerous? Or does it just feel that way? What story is your mind already attaching to this? This is not denial. It is not suppression. It is precision: the practice of locating where the suffering actually originates before committing to it.

And this is exactly what regulated breathing and cold exposure try to create in the body: a moment of space between stimulus and response. The Stoics were building that same capacity in the mind. The difference is that the Stoic practice works upstream. When the appraisal does not flag a threat, the cascade never starts. The pre-passion passes. The body settles, not because you forced it to, but because you never gave the signal to mobilise.

The eudaimonia reframe: what is actually at stake?

There is a deeper layer here that changes how we understand a significant portion of modern anxiety. The Stoics were not, ultimately, trying to feel calmer. Calm was a consequence, not the goal. The goal was eudaimonia, a Greek word often translated as happiness but better understood as flourishing: living well, becoming the person you are capable of being.

For the Stoics, eudaimonia had nothing to do with outcomes or comfort. It was about character: acting with honesty, wisdom, fairness, and courage, regardless of what was happening around you.

Now bring this to your own nervous system triggers. Someone ignores you. Someone takes credit for your work. A hoped-for response never comes. Plans fall through. Someone thinks less of you than you would like. Every one of these fires the threat response. But none of them actually threaten your character. None of them stop you from being honest, fair, or courageous. Comfort, status, ego, and preference may feel at risk. But eudaimonia? Untouched.

When the Stoic reframe is working, this question runs quietly in the background: Is this actually threatening anything that matters? Very often, the answer is no. The nervous system was preparing to defend something the Stoics would not have considered worth defending. This is not cold comfort. It is one of the most practically useful things ancient philosophy ever produced. Change the appraisal, and the cascade changes with it.

The dichotomy of control: the fastest stress reducer in the room

Epictetus began the Handbook with what is now called the dichotomy of control:

The dichotomy of control is not fatalism. Nothing about it says that nothing matters. Think of it as a triage system for attention and energy. The nervous system fires hardest at things we cannot control but believe we should be able to: the outcome of the conversation we prepared for, whether they reply, whether it goes the way we planned. We pour sympathetic activation into situations where it not only fails to help but actively harms our ability to respond well.

When we genuinely internalise, not just intellectually accept, that something sits outside our control, the appraisal shifts. The perceived threat weakens. The body, following the mind, begins to settle. Not because breathwork or cold forced it to calm down, but because the mind reassessed the signal and found a false alarm. This is top-down regulation, and it tends to be more durable than anything bottom-up, because it changes the default rather than just the acute episode.

You still need both

None of this argues against breathwork, cold exposure, or somatic practices. They work, they matter, and they deserve a place in the toolkit. Their place, though, is specific. These tools work best when the body is already activated, when the cascade has started and needs interrupting at the physiological level. A few slow exhales genuinely shift the autonomic state. Cold genuinely resets something. The value is real.

The issue is what happens in the gap they create. When you use the breath to pause, then walk straight back into the same interpretation, nothing changes. You soothe the symptom and leave the source intact. Tomorrow, the same situation, the same person, the same meeting will need soothing again.

Stoic practice works differently. Over time, it trains how you meet the impression in the first place. The goal is not to regulate after the response fires. It is to develop a relationship with your own thinking so that you question the false alarm before it becomes a crisis. The tools create the pause. Philosophy is what you do with it.

A practice that was always about real life

The Stoics were not writing for academics. Epictetus had been a slave. Marcus Aurelius ran an empire under near-constant crisis. Seneca navigated exile, power, and the proximity of death. They did not build a theory. They built a set of practices for the mind, designed to work in the middle of ordinary life.

Your nervous system does exactly what it was designed to do. It was just designed for a world that no longer exists, and somewhere along the way it started receiving a lot of false alarms. Breathwork creates the pause. The dichotomy of control triages what actually deserves your energy. The practice of assent interrupts your automatic agreement with every impression that arrives. The question of eudaimonia reframes what is actually at stake in the moments that feel most threatening.

That is the bridge the wellness world kept building toward, without quite arriving. The Stoics built it a long time ago.

Frequently Asked Questions

Can Stoicism actually calm the nervous system?

Not directly, and the Stoics would not have claimed otherwise. What Stoicism does is train you how to interpret events before the stress response fires. When the appraisal changes, the threat signal weakens and the body follows. It works upstream of the nervous system, at the level of judgment rather than physiology. The physiological calm is a consequence of the philosophical work, not a technique applied to the body.

What is the discipline of assent in Stoicism?

Assent is the act of agreeing with an impression, the initial signal your mind receives about something happening. The Stoics taught that this agreement is always, at least in principle, a choice. Between the impression and the response there is a gap. The discipline of assent is the practice of using that gap, of examining the impression before committing to it as accurate or threatening.

Did the Stoics know about the nervous system?

Not in the modern anatomical sense, but they observed the same phenomenon with remarkable precision. They identified involuntary physical reactions, which they called propatheiai or pre-passions, and distinguished them clearly from full emotional responses. Seneca wrote explicitly that no wisdom removes these first bodily reactions. What wisdom trains is what happens next: whether you assent to the impression or examine it first.

What is the difference between breathwork and Stoic practice?

Breathwork intervenes after the stress response has already fired, regulating the body from the bottom up. Stoic practice works top-down, training the appraisal that decides whether to fire the response at all. Both have value, but they operate at different points in the same chain. The breath creates the pause. Philosophy determines what you do with it. Used together, they address both the acute episode and the underlying pattern.

What is propatheia and why does it matter?

Propatheia are the involuntary first reactions of the body: the flinch, the blush, the racing heart, the pallor that arrives before any judgment has been made. The Stoics did not consider these emotions, because no assent had been given yet. They matter because they show that Stoicism never claimed we can suppress the body’s first response. What it claims is that the full emotional response, and the nervous system cascade that accompanies it, only escalates when we agree with the impression. The first motion is nature. What follows is philosophy.

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About the Author

Benny Voncken is the founder of Via Stoica and host of the Via Stoica Podcast. He has practiced Stoicism as a way of life for over six years, spoken at Stoicon, and led Stoic walks across Europe. Through Stoic coaching, he helps people use Stoic principles and practices to develop their own philosophy of life: one that gives them the tools to face obstacles, navigate change, and find more balance and peace. He writes, teaches, and walks wherever the philosophy takes him.