Seizure: Causes, Red Flags, Treatment & When to Seek Help

## Overview A seizure is a sudden, uncontrolled burst of abnormal electrical activity in the brain that temporarily disrupts normal neuronal signaling. Seizures can cause changes in behavior, movements, feelings, and levels of consciousness. They range from brief lapses of awareness (absence seizures) to prolonged episodes of violent shaking and loss of consciousness (generalized tonic-clonic seizures). Seizures are classified under ICD-10 code R56 and represent one of the most common neurological emergencies worldwide. Approximately 8–10% of people will experience at least one seizure during their lifetime, while active epilepsy — defined as recurrent, unprovoked seizures — affects roughly 50 million people globally [1]. In the United States alone, about 150,000 new cases of epilepsy are diagnosed each year [2]. People search for seizure-related information for many reasons: they or a loved one may have witnessed or experienced a seizure for the first time, they may be seeking guidance on what to do during an episode, or they may want to understand whether a seizure requires emergency medical attention. This article provides evidence-based information on seizure causes, first aid, treatment options, and when to seek professional care. It is important to note that a single seizure does not necessarily mean a person has epilepsy. The International League Against Epilepsy (ILAE) defines epilepsy as at least two unprovoked seizures occurring more than 24 hours apart, or one unprovoked seizure with a high probability of recurrence (≥60% over the next 10 years) [1]. Any new-onset seizure warrants medical evaluation to determine the underlying cause and guide appropriate management. ## Common Causes Seizures result from an imbalance between excitatory and inhibitory neurotransmission in the brain, leading to excessive, synchronous neuronal firing. Causes can be broadly divided into **provoked** (acute symptomatic) and **unprovoked** categories. ### Provoked (Acute Symptomatic) Seizures — Most Common 1. **Metabolic disturbances** — Hypoglycemia, hyponatremia, hypocalcemia, uremia, and hepatic encephalopathy can all lower the seizure threshold. Electrolyte imbalances disrupt the ionic gradients essential for normal neuronal membrane stability. 2. **Fever (febrile seizures)** — The most common cause of seizures in children aged 6 months to 5 years, affecting 2–5% of children. Rapid rises in body temperature are thought to lower the seizure threshold in developing brains [3]. 3. **Drug and alcohol-related** — Alcohol withdrawal is one of the most frequent causes of provoked seizures in adults, typically occurring 6–48 hours after cessation of heavy drinking. Certain drugs (cocaine, amphetamines, tramadol) can also provoke seizures. Abrupt withdrawal from benzodiazepines or barbiturates carries significant seizure risk. 4. **Infections** — Meningitis, encephalitis, and brain abscesses can trigger seizures through direct cortical irritation and inflammation. Globally, neurocysticercosis remains a leading cause of acquired epilepsy. 5. **Traumatic brain injury (TBI)** — Seizures can occur immediately after head trauma (early post-traumatic seizures) or develop weeks to years later (late post-traumatic epilepsy). The risk correlates with injury severity. 6. **Stroke and cerebrovascular disease** — Stroke is the leading cause of new-onset seizures in adults over age 60. Both ischemic and hemorrhagic strokes can cause seizures, with hemorrhagic events carrying a higher acute risk. ### Unprovoked Seizures 7. **Epilepsy (idiopathic/genetic)** — Many forms of epilepsy have a genetic basis, including juvenile myoclonic epilepsy, childhood absence epilepsy, and benign rolandic epilepsy. These involve mutations in ion channels or neurotransmitter receptors. 8. **Structural brain lesions** — Brain tumors, arteriovenous malformations, cortical dysplasias, and mesial temporal sclerosis can serve as epileptogenic foci. 9. **Autoimmune encephalitis** — Increasingly recognized, conditions such as anti-NMDA receptor encephalitis and anti-LGI1 encephalitis can present with seizures, psychiatric symptoms, and cognitive decline. 10. **Neurodegenerative diseases** — Alzheimer's disease and other dementias carry an increased seizure risk, particularly in advanced stages. ## RED FLAGS The following signs and symptoms warrant **immediate emergency medical attention** (call 911 / go to the ER): - **First-ever seizure** — Any seizure occurring for the first time requires urgent medical evaluation to rule out serious underlying causes - **Seizure lasting more than 5 minutes** — This constitutes **status epilepticus**, a life-threatening medical emergency that can cause permanent brain damage [4] - **Repeated seizures without regaining consciousness between episodes** (serial seizures / status epilepticus) - **Seizure occurring in water** (risk of drowning) - **Seizure in a pregnant woman** — May indicate eclampsia, a serious pregnancy complication - **Seizure accompanied by high fever and stiff neck** — Suggests meningitis or encephalitis - **Seizure following head trauma** — May indicate intracranial hemorrhage or brain injury - **Difficulty breathing or cyanosis (bluish skin)** after the seizure - **Prolonged postictal confusion** lasting more than 30 minutes - **Seizure in a person with diabetes** — May indicate severe hypoglycemia - **Known seizure patient whose seizure pattern has changed** (longer, more frequent, or different type) - **Seizure with signs of stroke** — Sudden weakness on one side, speech difficulty, facial drooping ## Self-Care at Home Self-care for seizures focuses on two areas: **seizure first aid** (what to do during and after a seizure) and **lifestyle modifications** to reduce seizure risk in those with known epilepsy. ### Seizure First Aid Evidence-based first aid during a witnessed seizure includes [5]: - **Stay calm and stay with the person** — Time the seizure using a watch or phone - **Protect the person from injury** — Clear away hard or sharp objects; place something soft under their head - **Turn the person on their side** (recovery position) once convulsions stop, to keep the airway clear - **Do NOT put anything in the person's mouth** — It is a myth that people can swallow their tongue during a seizure. Placing objects in the mouth risks injury to both parties - **Do NOT restrain the person** — Restraining someone during a seizure can cause fractures or dislocations - **Do NOT attempt CPR during active convulsions** — Breathing typically resumes after the seizure ends - **Stay with the person until they are fully alert** — Speak calmly and reassuringly during the postictal period ### Lifestyle Modifications for Seizure Prevention For individuals with diagnosed epilepsy, the following evidence-based measures may help reduce seizure frequency: - **Sleep hygiene** — Sleep deprivation is one of the most common and well-documented seizure triggers. Maintaining a regular sleep schedule of 7–9 hours is generally recommended [6] - **Stress management** — Chronic stress and anxiety can lower seizure thresholds. Techniques such as mindfulness meditation, cognitive behavioral therapy (CBT), and progressive muscle relaxation may be beneficial - **Alcohol avoidance or strict moderation** — Alcohol, particularly in excess or during withdrawal, is a potent seizure trigger - **Medication adherence** — Missing doses of prescribed antiseizure medications is a leading cause of breakthrough seizures. Pill organizers, phone alarms, and pharmacy reminder apps can support adherence - **Photosensitivity precautions** — For the ~3% of epilepsy patients with photosensitive epilepsy, avoiding flashing lights, using screen filters, and wearing polarized sunglasses may help - **Ketogenic diet** — A high-fat, low-carbohydrate diet has demonstrated efficacy in reducing seizure frequency, particularly in drug-resistant epilepsy. A 2018 Cochrane review found that the ketogenic diet reduced seizure frequency by ≥50% in 38–55% of children studied [7]. This diet should only be undertaken under medical supervision - **Regular physical activity** — Moderate exercise is generally safe and may improve seizure control. A systematic review found no increase in seizure frequency with regular physical activity and noted improvements in quality of life [8] ## OTC Medications That Help **Important:** There are no over-the-counter (OTC) medications that treat or prevent seizures. All antiseizure medications (ASMs) require a prescription. Self-treating seizures with OTC products is not recommended and may be dangerous. However, certain OTC products may play a supportive role in specific circumstances: | Class | Example | Adult Dose | Notes | |-------|---------|------------|-------| | Antipyretics (for febrile seizures prevention in children) | Acetaminophen (Tylenol) | 500–1000 mg every 4–6 hours (max 3000 mg/day) | May help manage fever, though evidence does not support antipyretics for preventing febrile seizure recurrence [3] | | Antipyretics (NSAID) | Ibuprofen (Advil, Motrin) | 200–400 mg every 4–6 hours (max 1200 mg/day OTC) | Same caveat as above; treats fever-related discomfort but does not prevent febrile seizures | | Electrolyte solutions | Oral rehydration salts (Pedialyte) | As directed | May help correct mild dehydration or electrolyte imbalances that can lower seizure threshold | | Vitamins | Magnesium supplements | 200–400 mg daily | Hypomagnesemia can provoke seizures; supplementation should only be used if deficiency is confirmed via blood test. Excess magnesium can cause diarrhea and, in extreme cases, cardiac complications | **Caution:** Several OTC medications can **lower the seizure threshold** and should be used with caution in people with epilepsy, including diphenhydramine (Benadryl) at high doses and certain decongestants (pseudoephedrine). Always consult a clinician or pharmacist before taking any new OTC medication if you have a seizure history. ## Prescription Options Antiseizure medications (ASMs) — formerly called anticonvulsants or antiepileptic drugs — are the cornerstone of seizure treatment. The choice of ASM depends on seizure type, epilepsy syndrome, patient age, comorbidities, and potential drug interactions. Treatment is typically initiated and managed by a neurologist or epileptologist. A landmark study demonstrated that approximately 47% of patients with newly diagnosed epilepsy become seizure-free on the first ASM tried, while about 13% respond to a second monotherapy [9]. ### First-Line Antiseizure Medications | Class | Example(s) | Typical Adult Dose | Notes | |-------|-----------|-------------------|-------| | Sodium channel blockers | Carbamazepine (Tegretol), Oxcarbazepine (Trileptal) | Carbamazepine: 400–1200 mg/day in divided doses | First-line for focal seizures. Carbamazepine can cause hyponatremia, Stevens-Johnson syndrome (HLA-B*1502 screening recommended in certain populations), and enzyme induction affecting other medications | | Sodium channel blockers (newer) | Lamotrigine (Lamictal), Lacosamide (Vimpat) | Lamotrigine: 100–400 mg/day (requires slow titration) | Lamotrigine is broadly effective and generally well tolerated. Preferred in women of childbearing age due to relatively favorable teratogenicity profile [10]. Slow titration essential to reduce rash risk | | SV2A ligands | Levetiracetam (Keppra), Brivaracetam (Briviact) | Levetiracetam: 1000–3000 mg/day in two divided doses | Widely used first-line for both focal and generalized seizures. Few drug interactions. May cause irritability, mood changes, and behavioral disturbance in some patients | | GABA modulators | Valproic acid/Valproate (Depakote) | 500–2000 mg/day in divided doses | Broad-spectrum; effective for generalized epilepsies. **Contraindicated in pregnancy** due to high teratogenicity risk (neural tube defects, cognitive effects). Associated with weight gain, tremor, hepatotoxicity, and pancreatitis | | Calcium channel (T-type) blockers | Ethosuximide (Zarontin) | 500–1500 mg/day | First-line for childhood absence epilepsy only; not effective for focal or tonic-clonic seizures | ### Second-Line and Adjunctive Medications | Class | Example(s) | Typical Adult Dose | Notes | |-------|-----------|-------------------|-------| | Sodium channel blockers | Phenytoin (Dilantin) | 200–400 mg/day | Older drug with narrow therapeutic index. Requires blood level monitoring. Long-term use associated with gingival hyperplasia, cerebellar atrophy, and osteoporosis | | GABAergic agents | Clobazam (Onfi), Clonazepam (Klonopin) | Clobazam: 10–40 mg/day | Benzodiazepines used as adjunctive therapy. Tolerance may develop. Clobazam is particularly used in Lennox-Gastaut syndrome | | Mixed mechanisms | Topiramate (Topamax), Zonisamide (Zonegran) | Topiramate: 100–400 mg/day | May cause cognitive side effects ("brain fog"), kidney stones, weight loss. Topiramate is teratogenic (cleft lip/palate risk) | | Cannabinoid | Cannabidiol (Epidiolex) | 2.5–10 mg/kg/day | FDA-approved for Dravet syndrome, Lennox-Gastaut syndrome, and tuberous sclerosis complex. Prescription only; not the same as OTC CBD products | ### Emergency / Rescue Medications | Class | Example(s) | Dose | Notes | |-------|-----------|------|-------| | Benzodiazepines | Diazepam rectal gel (Diastat), Midazolam nasal spray (Nayzilam), Diazepam nasal spray (Valtoco) | Per prescriber directions based on body weight | Prescribed as "rescue" medications for seizure clusters or prolonged seizures. Caregivers should be trained in administration | ### Non-Pharmacological Prescription Therapies - **Vagus nerve stimulation (VNS)** — An implanted device that delivers electrical impulses to the vagus nerve, reducing seizure frequency by approximately 50% in select patients - **Responsive neurostimulation (RNS)** — A device implanted in the brain that detects abnormal electrical activity and delivers targeted stimulation - **Epilepsy surgery** — Resective surgery (e.g., temporal lobectomy) may be curative for patients with drug-resistant focal epilepsy arising from an identifiable, resectable focus. Approximately 60–70% of carefully selected patients achieve seizure freedom after temporal lobe surgery ## Lab Tests Typically Ordered After a seizure, clinicians generally order a workup to identify the underlying cause, assess for complications, and guide management. The following tests are commonly considered: | Test | Rationale | |------|-----------| | [Complete blood count (CBC)](/tests/complete-blood-count) | Screen for infection, anemia, or hematologic abnormalities | | [Basic metabolic panel (BMP)](/tests/basic-metabolic-panel) | Assess sodium, potassium, calcium, glucose, and kidney function — all of which can provoke seizures when abnormal | | [Blood glucose](/tests/blood-glucose) | Hypoglycemia is a common, reversible cause of seizures | | [Serum magnesium](/tests/magnesium-blood-test) | Hypomagnesemia lowers seizure threshold | | [Liver function tests](/tests/liver-function-tests) | Hepatic encephalopathy can cause seizures; also important for baseline before starting hepatically metabolized ASMs | | [Toxicology screen (urine drug screen)](/tests/urine-drug-screen) | Identify drug or substance use as a potential seizure trigger | | [Blood alcohol level](/tests/blood-alcohol-level) | Alcohol intoxication and withdrawal are common seizure causes | | [Prolactin level](/tests/prolactin-test) | May help differentiate epileptic seizures from psychogenic nonepileptic events (PNEE) when drawn within 10–20 minutes of the event | | [Antiseizure medication levels](/tests/antiseizure-drug-levels) | For patients on known ASMs, subtherapeutic levels may explain breakthrough seizures | | **Electroencephalogram (EEG)** | Records brain electrical activity; essential for seizure classification and epilepsy diagnosis. Interictal epileptiform discharges support epilepsy diagnosis | | **Brain MRI** | Identifies structural causes: tumors, stroke, malformations, mesial temporal sclerosis, etc. Preferred over CT for non-emergency settings | | **CT head (non-contrast)** | Used in the emergency setting to rapidly rule out hemorrhage, mass effect, or acute stroke | | [Lumbar puncture / CSF analysis](/tests/lumbar-puncture) | When meningitis, encephalitis, or autoimmune encephalitis is suspected | ## Special Populations ### Children - **Febrile seizures** are the most common seizure type in children (ages 6 months–5 years). Simple febrile seizures (generalized, lasting <15 minutes, single occurrence within 24 hours) are generally benign and do not require long-term ASM therapy [3]. Antipyretic prophylaxis has not been shown to prevent recurrence. - **Neonatal seizures** require specialized evaluation and are often subtle (lip-smacking, cycling movements). Causes include hypoxic-ischemic encephalopathy, intracranial hemorrhage, infection, and metabolic disorders. - **Pediatric epilepsy syndromes** (e.g., infantile spasms, Dravet syndrome, Lennox-Gastaut syndrome) require management by a pediatric neurologist. Drug choices and dosing are weight-based and syndrome-specific. **Do not extrapolate adult doses to children** — consult a pediatric specialist for all medication decisions. - The ketogenic diet has its strongest evidence base in pediatric epilepsy and may be considered for drug-resistant cases under medical supervision [7]. ### Pregnancy - Seizure management in pregnancy requires careful balancing of seizure risk against teratogenic risk of ASMs. - **Valproic acid is contraindicated in pregnancy** whenever possible. It carries the highest risk of major congenital malformations (10.9%) and adverse neurodevelopmental outcomes among commonly used ASMs [10]. - **Topiramate** has also been associated with increased risk of oral clefts and is generally avoided. - **Lamotrigine and levetiracetam** are generally considered to have the most favorable safety profiles in pregnancy, though no ASM is without risk [10]. - Lamotrigine clearance increases significantly during pregnancy (up to 50–100%), often requiring dose adjustments guided by therapeutic drug monitoring. - **Folic acid supplementation** (at least 0.4 mg/day, often 4–5 mg/day for women on ASMs) is recommended before conception and during early pregnancy to reduce neural tube defect risk. - Women with epilepsy should discuss pregnancy planning with their neurologist **before conception** to optimize medication regimens. Abrupt discontinuation of ASMs is dangerous and may precipitate status epilepticus. - The FDA and EMA have issued specific guidance on the risks of valproate in pregnancy, including the Pregnancy Prevention Programme in Europe. ### Elderly - Stroke and neurodegenerative disease are the most common causes of new-onset seizures in adults over 60. - The elderly are more susceptible to ASM side effects, including sedation, cognitive impairment, dizziness, and falls. Lower starting doses and slower titration are generally recommended. - **Lamotrigine and levetiracetam** are often preferred in older adults due to fewer drug interactions and generally better tolerability compared to older agents such as phenytoin or carbamazepine. - Enzyme-inducing ASMs (carbamazepine, phenytoin, phenobarbital) can interact with anticoagulants, antihypertensives, and other medications commonly used in elderly patients, and may accelerate bone loss (increasing fracture risk). - Seizures in the elderly may present atypically — confusion, staring, or unexplained falls may be the only manifestation, leading to delayed diagnosis. ### Athletes - Most people with well-controlled epilepsy can safely participate in physical activity and sports. Exercise has not been shown to increase seizure frequency and may improve overall seizure control and quality of life [8]. - **High-risk activities** (scuba diving, rock climbing without belay, solo swimming) require careful individualized risk assessment. Sports governing bodies generally require a seizure-free period (often 1–2 years) before clearing athletes for high-risk activities. - Adequate hydration, sleep, and avoidance of overexertion are important, as dehydration, sleep deprivation, and extreme fatigue can lower the seizure threshold. - Contact sports are generally permissible if seizures are well controlled, though athletes should discuss specifics with their neurologist. - Some ASMs can affect athletic performance through fatigue, coordination changes, or impaired thermoregulation. Athletes should discuss these concerns with their prescribing physician. ## When to Escalate Knowing when to seek medical attention for a seizure is critical. The following thresholds can guide decision-making: ### Call 911 / Go to the ER Immediately - Any seizure lasting more than 5 minutes - A **first-ever seizure** in any person - Seizures occurring in clusters without recovery of consciousness between episodes - Seizure during pregnancy - Seizure after head injury - Seizure in water - Prolonged postictal confusion (>30 minutes), persistent neurological deficits, or failure to return to baseline - Seizure accompanied by fever with neck stiffness (possible meningitis) - Respiratory difficulty, cyanosis, or absence of breathing after the seizure - Known diabetes with suspected hypoglycemia-related seizure ### Same-Day / Urgent Care Visit - A person with known epilepsy who experiences a seizure that is **different from their usual pattern** (longer duration, different type, or increased frequency) - Suspected medication-related seizure (new medication started, dose changes) - Known epilepsy patient who has missed multiple doses of their ASM - Seizure in the context of acute illness, fever, or vomiting (inability to keep medications down) ### Scheduled GP / Neurologist Appointment (Within Days) - Follow-up after ER evaluation for a first seizure - Discussion of driving restrictions and return-to-work clearance after a seizure (laws vary by jurisdiction; many states require a seizure-free period of 3–12 months before driving) - Review of ASM efficacy if seizure frequency is increasing gradually - Medication side effects that affect quality of life but are not dangerous - Referral to an epilepsy center or epileptologist for drug-resistant epilepsy (failure of two appropriate ASMs at adequate doses) - Pregnancy planning in women with epilepsy - Discussion of surgical evaluation for refractory focal epilepsy ### General Guidance If you are uncertain whether a seizure requires emergency care, **err on the side of caution and call emergency services**. Seizures can be unpredictable, and early evaluation ensures the best outcomes. ## References [1] Fisher RS, Acevedo C, Arzimanoglou A, et al. ILAE official report: a practical clinical definition of epilepsy. *Epilepsia*. 2014;55(4):475-482. PMID:24730690. [2] Hauser WA, Beghi E. First seizure definitions and worldwide incidence and mortality. *Epilepsia*. 2008;49 Suppl 1:8-12. PMID:18184149. [3] Subcommittee on Febrile Seizures, American Academy of Pediatrics. Neurodiagnostic evaluation of the child with a simple febrile seizure. *Pediatrics*. 2011;127(2):389-394. PMID:21285335. [4] Trinka E, Cock H, Hesdorffer D, et al. A definition and classification of status epilepticus — Report of the ILAE Task Force on Classification of Status Epilepticus. *Epilepsia*. 2015;56(10):1515-1523. PMID:26336950. [5] Krumholz A, Wiebe S, Gronseth GS, et al. Evidence-based guideline: Management of an unprovoked first seizure in adults: Report of the Guideline Development Subcommittee of the American Academy of Neurology and the American Epilepsy Society. *Neurology*. 2015;84(16):1705-1713. PMID:25901057. [6] Malow BA. Sleep deprivation and epilepsy. *Epilepsy Curr*. 2004;4(5):193-195. PMID:16059497. [7] Martin-McGill KJ, Jackson CF, Bresnahan R, Levy RG, Cooper PN. Ketogenic diets for drug-resistant epilepsy. *Cochrane Database Syst Rev*. 2018;11(11):CD001903. PMID:30403286. [8] Pimentel J, Tojal R, Morgado J. Epilepsy and physical exercise. *Seizure*. 2015;25:87-94. PMID:25645634. [9] Kwan P, Brodie MJ. Early identification of refractory epilepsy. *N Engl J Med*. 2000;342(5):314-319. PMID:10660394. [10] Tomson T, Battino D, Bonizzoni E, et al. Comparative risk of major congenital malformations with eight different antiepileptic drugs: a prospective cohort study of the EURAP registry. *Lancet Neurol*. 2018;17(6):530-538. PMID:29680205. --- *Disclaimer: This article is for informational purposes only and does not constitute medical advice. Seizures require professional medical evaluation and management. Always consult a qualified healthcare provider for diagnosis, treatment decisions, and medication management. If you are experiencing a medical emergency, call 911 (or your local emergency number) immediately.*