A stress seizure is an episode that looks and feels like an epileptic seizure but isn’t caused by abnormal electrical activity in the brain. Instead, it’s a physical reaction of the nervous system to psychological stress, trauma, or emotional overload. The medical name is psychogenic nonepileptic seizure (PNES), though doctors increasingly use the term “functional seizure.” These episodes are more common than most people realize: an estimated 20% to 30% of patients referred to epilepsy monitoring units turn out to have functional seizures rather than epilepsy.
How Stress Seizures Differ From Epilepsy
During an epileptic seizure, neurons in the brain fire in sudden, uncontrolled bursts that show up clearly on an EEG. During a functional seizure, the brain’s electrical activity stays normal. What changes instead is how different brain networks communicate with each other, particularly networks involved in emotional processing, body awareness, and the sense of controlling your own movements. Brain imaging studies show altered connectivity between areas that handle emotion (like the insula and amygdala) and areas that control movement, along with changes in a region called the precuneus that plays a role in dissociation, the feeling of being disconnected from your own body.
This distinction matters because it means anti-seizure medications don’t work for functional seizures. In fact, they can make things worse. Yet up to 75% of people with functional seizures are initially misdiagnosed with epilepsy, and the average delay between that first wrong diagnosis and the correct one is 7 to 10 years.
What a Stress Seizure Looks Like
Functional seizures can involve shaking, stiffening, collapse, or unresponsiveness, which is why they’re so easy to confuse with epilepsy. But several physical features tend to set them apart.
- Duration: Functional seizures often last longer than five minutes. Most epileptic seizures resolve in one to two minutes.
- Eye closure: People having a functional seizure typically close their eyes, sometimes forcefully, and may resist attempts to open them. In epileptic seizures, the eyes are usually open or wide at onset.
- Movement patterns: Stop-and-go movements, side-to-side head shaking, body rocking, and out-of-phase limb movements are more common in functional seizures. Epileptic convulsions tend to be rhythmic and synchronous.
- Awareness during shaking: Some people remain partially aware during a functional seizure even while their whole body is moving. In epilepsy, bilateral convulsive activity almost always comes with complete loss of awareness.
- Gradual onset or offset: Functional seizures may build slowly and taper off, rather than starting and stopping abruptly.
Other clues include stuttering during the episode, whispering afterward, eye flutter, and episodes that intensify or ease depending on whether bystanders are present. None of these signs alone confirms a diagnosis, but together they form a recognizable pattern.
Common Triggers and Risk Factors
The word “stress” in “stress seizure” is somewhat of an understatement. While acute stress or a difficult situation can trigger an episode, the underlying causes often run deeper. Studies show that people with functional seizures have a 15% to 40% higher rate of past trauma and abuse compared to control groups. Over half of patients also have a co-occurring mental health condition: depression, anxiety, PTSD, or a personality disorder.
Physical triggers can also play a role. Pain, injury, illness, or sleep deprivation can set off an episode, especially in someone who already carries a high psychological burden. For many people, the seizures are not tied to a single stressful moment but reflect a nervous system that has become chronically dysregulated by accumulated stress or unresolved trauma. The brain essentially converts psychological distress into a physical event, which is why this condition falls under the broader category of functional neurological disorder.
How Doctors Confirm the Diagnosis
The gold standard is video-EEG monitoring, where you’re recorded on video while your brain’s electrical activity is tracked simultaneously. If you have a typical episode during the recording and your EEG shows normal brain activity throughout, that’s strong evidence you’re having functional seizures rather than epileptic ones. In epilepsy, the EEG would show characteristic spikes and disruptions before, during, or after the event.
Sometimes excessive movement during an episode creates so much interference on the EEG that the recording becomes hard to read. Even then, a completely normal EEG tracing immediately before and after a convulsive event is highly suggestive of a functional seizure. Doctors also look at the clinical features of the episode itself, such as eye closure, gradual onset, and preserved awareness, to build a complete picture.
Treatment and Recovery
Because functional seizures aren’t caused by abnormal electrical activity, the treatment is psychological rather than pharmacological. Psychotherapy is the primary approach, with cognitive behavioral therapy (CBT) having the strongest evidence behind it. CBT for functional seizures focuses on identifying the emotional and cognitive patterns that trigger episodes, developing strategies to interrupt the buildup to a seizure, and addressing the underlying trauma, anxiety, or depression that feeds the condition. A meta-analysis of 228 patients found that 47% achieved complete seizure freedom after completing psychological therapy.
Other therapeutic approaches that show promise include psychodynamic therapy, mindfulness-based interventions, and hypnotherapy. When medications are used, they target the co-occurring conditions rather than the seizures themselves, typically antidepressants or anti-anxiety medications.
The honest picture of long-term recovery, though, is mixed. Across multiple studies, roughly 40% of adults achieve full seizure remission during follow-up. One of the longest studies found that 71% of patients were still having seizures one to ten years after diagnosis. Children tend to do significantly better, with remission rates between 66% and 78%. Early diagnosis and strong engagement with therapy are consistently linked to better outcomes. The years spent on the wrong diagnosis and ineffective medications appear to make recovery harder, which is one reason closing that diagnostic gap matters so much.
What to Do During an Episode
If you witness someone having a functional seizure, the first-aid approach is the same as for an epileptic seizure. Keep the person safe from injury. If they’ve fallen, place something soft under their head. Don’t restrain them or try to hold them down. Don’t put anything in their mouth. Stay with them until the episode passes and they’ve recovered. The seizure itself is not dangerous in the way a prolonged epileptic seizure can be, but the person can still hurt themselves by falling or striking nearby objects.
For the person experiencing functional seizures, one of the most important steps is accepting the diagnosis. Many people initially feel dismissed or disbelieved when told their seizures aren’t epileptic, as if they’re being told it’s “all in their head.” Functional seizures are real, involuntary, and disabling. They’re just driven by a different mechanism than epilepsy, one that responds to different treatment.