Why might someone pass out after experiencing a seizure?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Passing out after a seizure, known as postictal syncope, typically occurs due to reduced oxygen flow to the brain, resulting in a temporary loss of consciousness similar to fainting. Seizures can also disrupt the heart's rhythm, causing it to beat abnormally slowly or briefly pause. This combination of neurological and cardiovascular effects can trigger a fainting episode immediately following the seizure.

Because post-seizure fainting can signal serious underlying issues affecting the brain, heart, or nervous system, it's important not to ignore these symptoms. A free, instant, online symptom check can help you better understand what may be causing your symptoms, identify potential conditions to discuss with a doctor, and guide you on the right next steps for care—all in just a few minutes.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn why passing out after a seizure occurs Discover if your fainting needs urgent care Find likely causes of post-seizure passing out See OTC options for seizure recovery symptoms Find a doctor for seizure-related fainting Understand home remedies after a seizure Check if passing out means something serious

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Explanation

Passing out after a seizure can occur because seizures can cause lack of oxygen to the brain, or affect the heart. Sometimes during a seizure, the heart can slow down a lot or even stop briefly. This is known as bradycardia or asystole.

Why it Happens:

Seizure Impact: When a person has a seizure, it can cause changes in the brain that affect how the heart works.
Heart Response: The heart might respond by beating very slowly or stopping for a few seconds, which can make someone faint.

Understanding Syncope:

Syncope is the medical term for fainting. It can be caused by the heart not pumping enough blood to the brain.
In some cases, people might have both seizures and syncope, making it tricky to know which came first.

These events can be serious, so if you're experiencing fainting after a seizure or similar concerning symptoms, use Ubie's free AI symptom checker to help understand your condition and determine the best next steps for care.

(References)

Duplyakov D, Golovina G, Lyukshina N, Surkova E, Elger CE, & Surges R. (2014). Syncope, seizure-induced bradycardia and asystole. Seizure, 24680552.
Koutrolou-Sotiropoulou P, Singh A, Leeman-Markowski M, & Rashba EJ. (2016). Syncope, seizure or both?. Acute cardiac care, 27869560.
Lai CW, & Ziegler DK. (1983). Repeated Self-Induced Syncope and Subsequent Seizures .... Archives of neurology, 6639412.

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