Why do fevers sometimes lead to seizures in children?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Fevers can sometimes trigger seizures in children, a condition known as a febrile seizure. This happens because a child's developing brain is more sensitive to rapid changes in body temperature, which can cause abnormal electrical activity in the brain. Febrile seizures most commonly occur in children between 6 months and 5 years old and are usually brief and harmless, though they can be frightening to witness.

If your child has had a fever with unusual symptoms, or if you're unsure whether their reaction is normal, it's worth getting clarity quickly. A free, instant, online symptom check can help you understand possible causes, gauge urgency, and decide whether home care, a doctor's visit, or emergency care is the right next step. In moments when every second of uncertainty feels stressful, having trusted guidance at your fingertips can bring peace of mind and help you act with confidence.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if fever triggered a seizure Discover likely causes of your child’s seizure See when seizures need urgent care Find OTC fever relief options Find pediatric neurology specialists nearby Understand safe home care for fevers Find out if this needs evaluation

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Explanation

Febrile seizures may occur in some children when they have a fever. This is because their brains are still growing and are more sensitive to changes in temperature.

Why Do Fevers Cause Seizures?

Rapid Temperature Rise: A quick increase in body temperature can trigger a seizure in some children. This doesn't happen to every child, but some are more sensitive.
Developing Brain: Young children's brains are still developing, making them more likely to have seizures when they have a fever.

Understanding Febrile Seizures:

Not Epilepsy: Febrile seizures are not the same as epilepsy, which is a condition where seizures occur without fever.
Common in Children: These seizures are most common in children between 6 months and 5 years old.

While febrile seizures can be scary for parents to witness, they are usually not harmful and do not mean the child will have epilepsy. If your child is experiencing fever or other concerning symptoms, use our free AI symptom checker to help understand what might be happening and whether you should seek immediate medical attention.

(References)

Berg AT. (1993). Are febrile seizures provoked by a rapid rise in temperature?. American journal of diseases of children (1960), 8213683.
Bender RA, Dubé C, & Baram TZ. (2004). Febrile seizures and mechanisms of epileptogenesis. Advances in experimental medicine and biology, 15250596.
Gupta A. (2016). Febrile Seizures. Continuum (Minneapolis, Minn.), 26844730.

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