Quasi‑Seizure (Non‑Epileptic) - Causes, Treatment & When to See a Doctor

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What is Quasi‑Seizure (Non‑Epileptic)?

A quasi‑seizure, also called a non‑epileptic seizure (NES) or psychogenic non‑epileptic seizure (PNES), is an event that looks like an epileptic seizure but does not arise from abnormal electrical activity in the brain. Instead, the episode is usually produced by psychological factors, stress, or other medical conditions that affect the nervous system. Because the outward signs (staring, shaking, loss of tone, etc.) mimic true seizures, NES are often misdiagnosed, leading to unnecessary anti‑seizure medication and delayed appropriate care.

These episodes are real and can be distressing, but the underlying mechanism is different from epilepsy. Understanding the distinction is essential for effective treatment and for avoiding the stigma that sometimes accompanies seizure disorders.

Common Causes

Quasi‑seizures are multifactorial. Below are the most frequently identified contributors, listed in no particular order:

• Psychological trauma – childhood abuse, sexual assault, or combat exposure can trigger PNES.
• Conversion disorder – a somatic‑type functional neurological disorder in which emotional distress is expressed as neurologic symptoms.
• Stress and anxiety disorders – chronic stress, panic attacks, or generalized anxiety may precipitate episodes.
• Depression – severe depression can manifest with dissociative or motor symptoms resembling seizures.
• Migraines – some patients develop aura‑like phenomena that can be mistaken for non‑epileptic seizures.
• Sleep disorders – obstructive sleep apnea or severe insomnia may lower the seizure threshold for functional events.
• Substance use – alcohol withdrawal, benzodiazepine rebound, or illicit drug intoxication can produce seizure‑like activity.
• Medication side‑effects – certain psychotropics (e.g., antipsychotics) can cause motor phenomena that look like seizures.
• Cardiovascular syncopal events – fainting with jerking movements may be misinterpreted as a seizure.
• Neurological conditions mimicking seizures – transient ischemic attacks, hypoglycemia, or metabolic encephalopathies.

Associated Symptoms

While the hallmark of a quasi‑seizure is the seizure‑like activity itself, several accompanying features can help differentiate it from epileptic seizures:

• Prolonged duration – episodes often last >2 minutes, whereas most epileptic seizures are <2 minutes.
• Gradual onset and offset – the movements start and end slowly rather than the abrupt “jack‑knife” pattern of epilepsy.
• Preserved awareness – the person may respond to their name or follow simple commands during the event.
• Asynchronous limb movements – one arm may move while the other is still, unlike the generalized clonic activity typical of many epileptic seizures.
• Emotional triggers – episodes often follow a stressful conversation, an argument, or a painful memory.
• Absence of post‑ictal confusion – patients usually regain full cognition immediately after the event.
• Self‑injury or low‑impact falls – injuries are usually minor (e.g., bruises) compared with the lacerations or fractures seen in tonic‑clonic seizures.
• History of psychiatric illness – prior diagnoses of anxiety, depression, PTSD, or personality disorders are common.

When to See a Doctor

Because quasi‑seizures can mimic true seizures, any new or unexplained seizure‑like event warrants medical evaluation. Seek professional help promptly if you notice any of the following “red‑flag” features:

• First‑time seizure‑like episode, especially if it occurs after head trauma or a new medication.
• Sudden change in the pattern of previously diagnosed epileptic seizures.
• Injury requiring medical attention (e.g., broken bone, head wound).
• Prolonged unconsciousness (>5 minutes) or difficulty breathing during an episode.
• Recurrent episodes that interfere with daily activities, work, or school.
• Signs of depression, suicidal thoughts, or severe anxiety accompanying the events.
• Any concern that the seizures might be drug‑related or due to withdrawal.

Diagnosis

Diagnosing quasi‑seizures is a stepwise process that blends neurological, psychiatric, and often neurophysiological evaluations. The goal is to rule out epileptic seizures and identify the functional origin.

1. Detailed Clinical History

The clinician will ask about the event’s onset, duration, triggers, aura, recovery, and any preceding emotional stress. A collateral history from a family member or friend is invaluable because patients may have limited recall.

2. Physical and Neurological Examination

A thorough exam usually shows no focal neurological deficits, which helps differentiate NES from structural brain disease.

3. Electroencephalogram (EEG)

Standard scalp EEG is the gold standard for detecting epileptiform activity. In NES, the EEG remains normal during the event, whereas epileptic seizures produce characteristic spikes or rhythmic discharges. Prolonged video‑EEG monitoring (often 24‑48 hours) is considered the most definitive test because it captures the event while simultaneously recording brain activity.

4. Neuroimaging

Magnetic resonance imaging (MRI) or computed tomography (CT) may be ordered to rule out structural lesions (tumors, vascular malformations) that could cause seizures.

5. Psychiatric Evaluation

Given the strong link to mental health, a referral to a psychologist or psychiatrist is common. Standardized tools such as the Patient Health Questionnaire‑9 (PHQ‑9) for depression, Generalized Anxiety Disorder‑7 (GAD‑7), and the Somatic Symptom Scale‑8 (SSS‑8) help quantify psychological contributors.

6. Laboratory Tests

Basic labs (glucose, electrolytes, thyroid function) are performed to exclude metabolic causes that can mimic seizures.

Treatment Options

Effective management is usually multimodal, involving both medical and psychosocial interventions.

1. Education & Reassurance

Explaining the functional nature of the episodes reduces stigma and empowers patients to engage in therapy. Studies show that clear communication improves adherence and outcomes (Mayo Clinic, 2023).

2. Psychotherapy

• Cognitive‑Behavioral Therapy (CBT) – Helps patients identify triggers, develop coping skills, and alter maladaptive thoughts.
• Dialectical Behavior Therapy (DBT) – Particularly useful when emotional dysregulation or self‑harm behaviors coexist.
• Trauma‑Focused therapies – EMDR (Eye Movement Desensitization and Reprocessing) or prolonged exposure therapy for patients with a history of abuse.

3. Psychiatric Medications

There is no “anti‑NES” drug, but treating underlying mood or anxiety disorders can reduce episode frequency. Commonly prescribed agents include:

• Selective serotonin reuptake inhibitors (SSRIs) for depression/anxiety.
• Atypical antipsychotics (e.g., quetiapine) for severe agitation or comorbid psychosis.
• Low‑dose benzodiazepines for short‑term anxiety control (used cautiously to avoid dependence).

4. Physical & Occupational Therapy

When episodes lead to deconditioning or functional impairment, tailored rehab programs improve strength, balance, and confidence.

5. Stress‑Management Techniques

• Mindfulness‑based stress reduction (MBSR)
• Progressive muscle relaxation
• Regular aerobic exercise (30 minutes most days)

6. Medication Review

Discontinuing unnecessary anti‑seizure drugs (after neurologist approval) can prevent side‑effects such as fatigue, bone loss, or cognitive slowing.

7. Support Groups

Peers who have experienced NES often provide practical tips and emotional support. Organizations such as the Epilepsy Foundation host NES‑specific meetings.

Prevention Tips

While “prevention” of an underlying functional disorder is not always possible, several strategies can lower the likelihood of an episode or lessen its severity:

• Identify personal triggers – keep a diary of events, stressors, sleep patterns, and diet.
• Maintain a regular sleep schedule – aim for 7‑9 hours of quality sleep; insomnia is a known precipitant.
• Practice daily stress‑reduction – meditation, yoga, or breathing exercises for at least 10 minutes.
• Limit caffeine, alcohol, and illicit substances – these can aggravate anxiety and alter brain chemistry.
• Stay physically active – regular exercise improves mood and lowers stress hormones.
• Follow up consistently – attend scheduled therapy and medication appointments.
• Build a crisis plan – know who to call (therapist, emergency services) if an episode occurs in a risky setting (e.g., driving).
• Educate family and coworkers – awareness reduces accidental injury and promotes supportive responses.

Emergency Warning Signs

Key Take‑aways

Quasi‑seizures are real, distressing events that arise from psychological or functional neurological processes rather than abnormal brain electricity. Accurate diagnosis—usually through video‑EEG monitoring—allows healthcare providers to shift treatment from anti‑seizure drugs to targeted psychotherapy, stress management, and, when needed, psychiatric medication. Early recognition, education, and a multidisciplinary care plan dramatically improve quality of life and reduce the frequency of episodes.

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References (selected)

• Mayo Clinic. “Psychogenic non‑epileptic seizures.” Updated 2023. https://www.mayoclinic.org
• World Health Organization. “Mental health and neurological disorders.” 2022. https://www.who.int
• Cleveland Clinic. “Non‑epileptic seizures (PNES).” 2024. https://my.clevelandclinic.org
• National Institute of Neurological Disorders and Stroke. “Psychogenic Seizures.” 2023. https://www.ninds.nih.gov
• American Academy of Neurology. Practice guideline on epilepsy and NES, 2022.
• Herscovici, D. et al. “Outcome of cognitive‑behavioral therapy for PNES.” *Neurology* 2021; 97:e1245‑e1253.

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