Let’s talk about what happens neurologically during a seizure and how our nervous system can adapt and change.
*Important note: This newsletter is meant to be educational and a complement to the care your neurologist or medical team provides, not a replacement for it. We believe in a collaborative, whole-nervous-system approach to complex conditions.
If you love someone who lives with seizures, you know what it's like to be in a constant state of watching. Watching for triggers. Watching for warning signs. Watching for the thing that tips the scale.
Most conversations about seizures focus on what to do when one happens. Far fewer conversations focus on what's happening in the nervous system between seizures — and why some people seem to exist on such a razor's edge, where a rough night of sleep or a stressful week can shift things so dramatically.
We want to share a framework that changes the way a lot of families and individuals think about seizures, not as a mystery to manage, but as a signal about nervous system capacity that can actually be addressed.
Understanding the seizure threshold
Every nervous system has what we can think of as a threshold: a line between stability and instability. When stress stays below that line, the nervous system absorbs it and recovers. When stress exceeds it, the system destabilizes. In someone whose nervous system is already taxed and has very little reserve built up, that threshold sits low — and it doesn't take much to cross it.
For someone with a high threshold and a well-regulated nervous system, the same stressors — a night of disrupted sleep, a stressful week, a growth spurt, an illness — land and get absorbed. The nervous system has enough buffer, or what researchers sometimes call "neurological slack," to handle the load without destabilizing.
This is why the same environmental stress hits people so differently. It's not that some people are unlucky. It's that the amount of reserve the nervous system has available changes everything about how it responds to the same demands.
What lowers the threshold — and why it's rarely one thing
In seizure-prone individuals, the threshold tends to be chronically low — meaning the nervous system is already running close to its limit just to maintain basic function. When small stressors then layer on top, it doesn't take much to cross the line. Common threshold-lowering stressors include:
Poor or fragmented sleep
Illness, infection, or immune activation
Growth spurts and developmental surges (in kids)
Sensory overload: lights, noise, crowds
Emotional stress, anxiety, or schedule disruption
Gut inflammation and digestive dysfunction
None of these triggers is the "cause" of seizures in the way a broken bone causes pain. They're stressors that push a nervous system with insufficient reserve past the point it can hold. The real target isn't the trigger, it's the threshold itself. Raise the threshold, build the reserve, and the same triggers that used to tip the scale stop doing so.
Where the spine comes in — and why it matters more than people expect
The brainstem — the structure that sits at the base of the skull and the top of the spinal cord — is the master regulator of the autonomic nervous system. It governs the balance between sympathetic overdrive and parasympathetic recovery. It controls the quality of sensory information flowing up to the brain. It plays a central role in how the brain processes and responds to stress.
When there is tension, misalignment, or subluxation in the upper cervical spine it creates a kind of continuous neurological noise that feeds into the brain from below. The brain has to work constantly to process and compensate for this distorted input, which drains the very neurological resources it needs to maintain stability and keep the seizure threshold elevated.
In seizure-prone individuals, this upper cervical tension pattern creating neurological interference at the brainstem level is one of the most consistent and consequential findings we see. It doesn't cause seizures in isolation. But it significantly and quietly lowers the threshold, leaving the nervous system with less capacity to absorb the stressors that eventually tip the scale.
How neurologically-focused chiropractic care supports the threshold
Neurologically-focused chiropractic adjustments — particularly those targeting the upper cervical spine and the transition zones where neurological tension accumulates — work to reduce that distorted input to the brainstem. When the spine moves more freely, more symmetrically, and with less interference, the quality of information flowing to the brain improves. The brain no longer has to devote significant processing resources to compensating for neurological noise coming from below.
Over time, as that interference clears, several things tend to shift:
Sleep deepens and becomes more restorative
As brainstem regulation improves and the parasympathetic system can activate more fully, sleep onset improves and nighttime waking decreases. Better sleep is one of the most significant drivers of an elevated seizure threshold — and in most cases it emerges naturally as the nervous system becomes more regulated, rather than being something that has to be directly trained.
Gut and immune function stabilize
The vagus nerve — which connects the brainstem to the gut and immune system — carries significantly more traffic from body to brain than the other direction. When vagal tone improves and the nervous system shifts toward parasympathetic dominance, digestive regularity often improves, inflammatory patterns settle, and the immune system responds more proportionately — removing several major threshold-lowering contributors simultaneously.
The brain processes sensory information more efficiently
With less distorted input flooding the brainstem, cortex, and cerebellum, the brain gains neurological resources it previously spent on compensating. That freed capacity contributes directly to a more expansive threshold — one that can absorb the same stressors that previously triggered instability without being destabilized by them.
Emotional regulation and stress tolerance improve
As the autonomic nervous system finds more balance, the all-or-nothing stress response that characterizes a depleted nervous system gradually softens. Emotional volatility decreases. Recovery after stressful events happens faster. The nervous system starts to feel less like it's running on a razor's edge — because it isn't.
One important thing to understand about progress
Progress in complex neurological cases is rarely linear. Illness, growth spurts, life stressors, and developmental periods will temporarily draw from neurological reserve — and during those windows, threshold can dip before it rises again. This is not a sign that care isn't working. It's the nervous system building capacity under real-world conditions, which is exactly how genuine, lasting change is made.
The goal we work toward together isn't the elimination of every stressor — that's not realistic for any nervous system. The goal is a nervous system that handles stress without breaking. One where the threshold is high enough, and the reserve deep enough, that the ordinary demands of life don't push it past the edge.
Do you know someone who needs to hear this?
If you're reading this and thinking of someone, maybe a friend whose child has been struggling with seizures, a family member who's been managing epilepsy for years, someone who's been told there's nothing more that can be done, please share this with them. The nervous system capacity framework changes the conversation. It opens a door that medication management alone often can't.
We work alongside medical teams, not against them. But we bring a lens that most neurological care doesn't include — and for many families, it's been the piece that finally made the difference.
