Non-epileptic seizures look and feel like epileptic seizures, but they aren’t caused by abnormal electrical activity in the brain. During an epileptic seizure, neurons fire in sudden, synchronized bursts that show up clearly on brain monitoring. During a non-epileptic seizure, that electrical disruption simply isn’t there. The brain’s wiring is functioning normally, even though the body is shaking, the person is unresponsive, or their limbs are moving involuntarily.
These episodes are real, not faked. They fall into two broad categories: those driven by psychological factors (by far the most common) and those caused by other medical conditions like fainting spells or migraines. The psychological type, often called psychogenic non-epileptic seizures or PNES, accounts for roughly 20% of patients referred to specialist epilepsy clinics. Despite being common, they’re frequently misdiagnosed as epilepsy, with an average delay of eight years between when symptoms start and when the correct diagnosis is made.
How They Differ From Epileptic Seizures
The core difference is what’s happening inside the brain. An epileptic seizure produces a measurable burst of abnormal cortical activity. A non-epileptic seizure does not. From the outside, though, the two can look strikingly similar, which is why distinguishing them is so difficult for both patients and doctors.
Certain physical features during the event tend to point toward a non-epileptic cause. Convulsive episodes lasting longer than 10 minutes, rapid side-to-side head movements, limbs moving out of sync with each other, eyes staying closed throughout, and awareness that seems to come and go during a convulsive event are all more characteristic of non-epileptic seizures. Fluctuating patterns of movement and moments where the person appears briefly distractible during an episode also lean toward a non-epileptic explanation. None of these signs is definitive on its own, though. Out-of-phase limb movements and pelvic thrusting, for example, can occasionally occur with seizures originating in the frontal lobe of the brain.
What Causes Them
Psychogenic non-epileptic seizures are the body’s response to psychological distress. The brain converts emotional overload into a physical event. This isn’t a conscious choice. It’s an involuntary process, similar to how extreme stress can cause someone to faint or develop a stress-related headache, but far more dramatic.
Trauma is the most extensively studied risk factor. Studies of PNES patients consistently show very high rates of past trauma (44% to 100%) and physical or sexual abuse (23% to 77%), rates that run 15% to 40% higher than in comparison groups. People with PNES also show higher rates of PTSD, leading some researchers to propose that these seizures may be a dissociative expression of post-traumatic stress. During a dissociative episode, the brain essentially disconnects from conscious control of the body, producing seizure-like symptoms.
Other factors that increase the likelihood of PNES include a history of mental health conditions (including personality disorders), chronic pain syndromes like fibromyalgia or chronic fatigue, and substance use disorders. Episodes are often triggered by emotional or social stressors, though many patients can’t identify a specific trigger in the moment.
Non-Psychological Causes
Not all non-epileptic seizures are psychogenic. Some are caused by other physiological conditions that can mimic a seizure. Syncope (fainting) is the most common of these, particularly in children and older adults. Migraines, transient ischemic attacks (brief interruptions in blood flow to the brain), and sleep disorders like parasomnias can also produce seizure-like events. These physiological mimics are important to rule out during diagnosis, especially at the extremes of age.
How Non-Epileptic Seizures Are Diagnosed
The gold standard is inpatient video EEG monitoring, where a patient stays in a hospital epilepsy monitoring unit with continuous video recording and brain wave tracking running simultaneously. The goal is to capture an actual episode on camera while the EEG records brain activity. If an event occurs and the EEG shows no change in cortical activity, that’s strong evidence for a non-epileptic seizure.
This test has limitations, however. The absence of EEG changes alone isn’t always enough to make the diagnosis. Clinicians interpret the brain recording alongside what the video shows: the specific movements, the patient’s level of awareness, how the event begins and ends. If the camera misses the start of an episode, for instance, the behavior that follows can be confused with a non-epileptic event. Video EEG is most useful when there are visible motor signs or a clear loss of responsiveness during the recorded event.
A comprehensive evaluation also includes a neurological workup and a psychosocial assessment. One of the strongest clues before monitoring even begins is treatment resistance. If seizures persist despite trials of two or more anti-seizure medications, a non-epileptic cause becomes increasingly likely, since these drugs have no effect on seizures that aren’t generated by abnormal brain electricity.
Why Misdiagnosis Is So Common
Eight years is a long time to live with the wrong diagnosis, but it’s the average for adults with PNES. Several factors contribute to this delay. The episodes genuinely look like epilepsy to emergency room doctors, family members, and even neurologists who haven’t captured an event on video EEG. Many patients are started on anti-seizure medications after their first episode and stay on them for years, experiencing side effects from drugs that were never going to help.
The overlap between the two conditions adds another layer of complexity. Some people have both epileptic and non-epileptic seizures, making it even harder to sort out what’s happening without prolonged monitoring. And because PNES carries psychological underpinnings, some patients initially resist the diagnosis, feeling it implies their symptoms aren’t real. The symptoms are entirely real. The cause is different from what was first assumed.
Treatment and Recovery Outlook
Psychological therapy is the first-line treatment, and it’s the most studied intervention for this condition. The approach most commonly used is a specialized form of cognitive behavioral therapy adapted for seizures. The therapy helps patients recognize the emotional and physical warning signs that precede an episode, develop strategies to interrupt the escalation, and address the underlying psychological factors (trauma, anxiety, dissociation) driving the events.
A large meta-analysis of psychological treatment studies found that about two in five patients (40%) were completely seizure-free by the end of treatment, and roughly two in three (66%) experienced at least a 50% reduction in how often seizures occurred. Seizure frequency dropped by a median of about 6.5 episodes per month during treatment. These gains held up over time: at follow-up, 36% remained seizure-free and 75% maintained at least a 50% improvement.
Full seizure freedom is possible but not guaranteed. The more realistic outcome for most people is a significant reduction in seizure frequency and severity, along with better tools for managing episodes when they do occur. The trajectory matters, too. Getting the correct diagnosis is itself therapeutic. Many patients report improvement simply from understanding what’s actually happening in their body, which removes the fear and confusion that can perpetuate the cycle.
Living With the Diagnosis
Receiving a PNES diagnosis can feel confusing or even dismissive if it’s not explained well. It helps to understand that this condition sits within a broader category called functional neurological disorder, where the nervous system doesn’t function properly even though its structure is intact. Think of it like a software problem rather than a hardware problem. The brain’s “wiring” is fine, but the signals are misfiring.
Day-to-day management often involves identifying personal triggers (stress, sleep deprivation, conflict, sensory overload), building consistent routines, and continuing therapy. Some people benefit from antidepressant medication to address co-occurring depression or anxiety, though medication alone doesn’t treat the seizures themselves. Physical therapy can also help patients who develop movement-related symptoms or who avoid physical activity out of fear of triggering an episode.
Recovery isn’t always linear. Some people see rapid improvement once they begin appropriate treatment, while others work through deeply rooted trauma over months or years. The critical first step is an accurate diagnosis, which opens the door to treatments that actually target the cause.