FND seizures are seizure-like episodes caused by changes in how brain networks function, not by the abnormal electrical activity that drives epileptic seizures. They fall under functional neurological disorder (FND), a condition where the brain’s signaling goes awry without any structural damage or disease visible on scans. These episodes can look remarkably similar to epileptic seizures, involving shaking, loss of awareness, and unusual movements, which is why the average time from first episode to correct diagnosis is over seven years.
How Functional Seizures Differ From Epilepsy
In epilepsy, seizures result from a sudden surge of uncontrolled electrical activity in the brain. Functional seizures produce similar-looking episodes, but brain wave recordings during an event show no abnormal electrical discharges. The underlying problem appears to involve disruptions in how different brain networks communicate with each other, particularly networks involved in attention, body awareness, and the sense of self. Think of it as a software glitch rather than a hardware problem: the brain’s structure is intact, but its programs aren’t running correctly.
This distinction matters because anti-seizure medications, which work by calming electrical activity, don’t help functional seizures. Yet in one large study of 297 patients, 87% had been prescribed at least one anti-seizure medication before receiving the correct diagnosis. Many had tried multiple medications, accumulating 894 total drug trials that were ultimately unnecessary.
What Functional Seizures Look Like
Functional seizures vary widely from person to person, but neurologists have identified patterns that help distinguish them from epileptic seizures. Common features of functional seizures include eyes closing during the episode, jerking movements where the limbs move out of sync with each other, side-to-side head shaking, pelvic thrusting, and a waxing-and-waning pattern where the intensity fluctuates throughout the event.
Epileptic seizures, by contrast, more often involve eyes staying open, the head turning forcefully to one side, limbs jerking in sync, stiff or twisted posturing of the arms and legs, and repetitive automatic movements like lip smacking or hand fumbling. These patterns aren’t absolute rules. Some functional seizures look nearly identical to epileptic ones, which is exactly why formal testing is so important.
During and after a functional seizure, a person may experience temporary loss of attention or memory, confusion, fatigue, or emotional distress. Episodes can last anywhere from seconds to many minutes, and some people experience several in a single day.
How Functional Seizures Are Diagnosed
The gold standard for diagnosis is inpatient video-EEG monitoring, where a person stays in a hospital unit with continuous brain wave recording and video surveillance until a typical episode occurs. If the event looks like a seizure on camera but the EEG shows normal brain activity during it, that confirms a functional seizure. When both the visible symptoms and the EEG reading align, the diagnosis is considered definitive.
Smartphone videos recorded by family members or bystanders can also be useful. When doctors review home videos alongside the patient’s medical history and physical exam, these video-based assessments have proven both highly specific and sensitive compared to formal inpatient monitoring. However, if the home video and clinical picture don’t match up clearly, inpatient monitoring is still needed.
The diagnostic delay for functional seizures is striking. One study of 268 patients found a mean delay of 8.4 years between the first seizure and the correct diagnosis, with some patients waiting as long as 52 years. This delay happens largely because functional seizures look so much like epileptic seizures, and epilepsy is far more common, so it tends to be the first assumption.
What Causes Them
There is no single cause. Functional seizures arise from a complex mix of predisposing factors, triggers, and perpetuating conditions. Many people with functional seizures have a history of psychological trauma, chronic stress, anxiety, or depression, but not all do. Physical illness, surgery, or even a prior diagnosis of epilepsy can serve as a trigger. Some people develop functional seizures after a concussion or other physical injury.
The current understanding is that these seizures reflect a breakdown in the brain’s ability to regulate its own activity, particularly in networks responsible for attention, self-awareness, and the integration of sensory and motor signals. The episodes are involuntary. They are not faked or deliberately produced. This is one of the most important points for patients and families to understand, because the outdated idea that these seizures are “all in your head” creates stigma and delays treatment.
Treatment Options
Cognitive behavioral therapy (CBT) is the best-studied treatment for functional seizures and has high-quality evidence supporting its use. A meta-analysis of randomized controlled trials involving 450 participants found that people receiving CBT alongside standard medical care were roughly twice as likely to become seizure-free compared to those receiving standard care alone. CBT also reduced anxiety and improved overall quality of life. The therapy works by helping people identify and change the thought patterns, emotional responses, and behaviors that feed into seizure episodes.
Beyond CBT, treatment typically involves a multidisciplinary approach. This can include physiotherapy to address movement and body awareness, occupational therapy for daily functioning, and psychological support for any coexisting anxiety or trauma. The first step in treatment, and one of the most powerful, is simply receiving and accepting the diagnosis. Understanding what is happening in your brain, and that it is a real neurological condition, gives many people a framework to start improving.
Long-Term Outlook
Recovery from functional seizures is possible, but outcomes vary significantly depending on age, how long someone has had the condition, and whether they accept the diagnosis. In children, the prognosis is considerably better: around 70% achieve seizure remission. For adults, the picture is more challenging. Fewer than 4 in 10 newly diagnosed adults become seizure-free within five years. One long-term follow-up study found that 71% of patients were still experiencing seizures one to ten years after diagnosis.
That said, even when seizures don’t stop entirely, many people see meaningful improvement. Nearly half of patients in one study achieved at least a 50% reduction in seizure frequency after diagnosis. Several factors predict better outcomes: younger age at onset, shorter duration of symptoms before diagnosis, accepting the diagnosis, being employed, having strong social support, and maintaining an independent lifestyle. Factors linked to worse outcomes include coexisting epilepsy, additional psychiatric conditions, a dependent lifestyle, and poor interpersonal relationships.
The gap between symptom onset and diagnosis, averaging over seven years, represents a major lost opportunity. Every year spent on the wrong diagnosis often means unnecessary medications, avoidable emergency department visits, and worsening of the condition. Early, accurate diagnosis followed by appropriate therapy gives people the best chance of recovery.