Question explored with the scientific record
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- 1 Could covid vaccines cause epilepsy
- 2 Do studies compare vaccinated vs unvaccinated groups for epilepsy risk?
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Do studies compare vaccinated vs unvaccinated groups for epilepsy risk?
The short version: no study in this retrieval directly compares epilepsy incidence in vaccinated versus unvaccinated people.
The retrieved records all study people who already have epilepsy, asking whether vaccination worsens their seizures. An Italian study of 358 adults found 25 (about 7 in 100) had a transient increase in seizure frequency, mostly among those with poorly controlled epilepsy [1]. A 2024 study of 786 patients found no significant increase in average seizure frequency after vaccination [2]. A 2025 Saudi cross-sectional study of 67 patients found no statistically significant association between vaccination and seizure frequency change [3]. None of these include an unvaccinated control group for comparison.
The question asks about new epilepsy developing after vaccination, not seizure worsening in existing epilepsy. The closest evidence is a 2025 Iranian cohort of nearly 90,000 adults that found 5 cases of generalized seizure after Sputnik V and AZD1222 [5], and a Mexican pediatric surveillance review that reported 2 seizure cases after 1.99 million doses [6]. But a single seizure is not epilepsy, which requires recurrent unprovoked seizures. No study here follows people long enough to make that diagnosis.
A 2023 case report describes a 19-year-old man with a history of epilepsy who died after COVID-19 vaccination and infection, but his death was linked to multiple sclerosis flare, not new epilepsy [4]. A 2022 case report describes anti-NMDA receptor encephalitis after vaccination, which can cause seizures, but this is a rare autoimmune condition, not typical epilepsy [6].
My call: the evidence does not answer whether COVID-19 vaccines cause new epilepsy because no study in this retrieval compares vaccinated to unvaccinated people for that outcome. Confidence: low.
Sources used 6
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Impact of COVID-19 vaccine on epilepsy in adult subjects: an Italian multicentric experience
This multicentric observational study investigates the safety and tolerability of COVID-19 vaccines in adults with epilepsy, finding that a small percentage experienced a transient increase in seizure frequency post-vaccination, primarily among those with poorly controlled epile…
DOI: 10.1007/s10072-022-06100-0 -
Risk of Seizure Aggravation after COVID-19 Vaccinations in Patients with Epilepsy
This study investigates the risk of post-vaccination seizure aggravation in patients with epilepsy following COVID-19 vaccinations, finding no significant increase in seizure frequency and identifying predictors for seizure aggravation.
DOI: 10.3390/vaccines12060593 -
COVID-19 vaccine impact on seizure control in patients with epilepsy: insights from Saudi Arabia
A cross-sectional study of 67 adult epilepsy patients in Saudi Arabia found that during the COVID-19 pandemic, 23.9% experienced increased seizure frequency, 11.9% experienced decreased frequency, and 64.2% reported no significant change; logistic regression found no statistical…
DOI: 10.1186/s41983-025-00948-7 -
Sudden Death Associated With Possible Flare-Ups of Multiple Sclerosis After COVID-19 Vaccination and Infection: A Case Report and Literature Review
This study presents an autopsy case of a 19-year-old man with a history of epilepsy, whose sudden death was linked to multiple sclerosis exacerbated by COVID-19 vaccination and infection, highlighting the potential neurological impacts of these events.
DOI: 10.3346/jkms.2023.38.e78 -
Clinical Research into Central Nervous System Inflammatory Demyelinating Diseases Related to COVID-19 Vaccines
This study investigates the association between COVID-19 vaccines and central nervous system inflammatory demyelinating diseases (CNS IDDs), presenting a case of myelin oligodendrocyte glycoprotein (MOG) antibody-associated disease following AstraZeneca vaccination and reviewing…
DOI: 10.3390/diseases12030060 -
Anti-N-Methyl-D-Aspartate Receptor Encephalitis after BNT162b2 COVID-19 Vaccination
This study reports a rare case of anti-N-methyl-D-aspartate receptor encephalitis triggered by the BNT162b2 COVID-19 vaccination in a female patient with an ovarian teratoma.
DOI: 10.14581/jer.22013