Pronounced: FEEB-ril SEE-zherz
by Cynthia M. Johnson, MA
A febrile seizure is a convulsion that may happen when a baby or young child has a fever over 100.4° F (38° C).
A high fever is thought to trigger the seizure. The fever is most often caused by infections. Rarely, some may be caused by fever after routine immunizations.
This problem is more common in children who are 6 months to 3 years old. The risk may last until age 5. Other things that may raise the risk are:
A seizure often lasts a few seconds up to 15 minutes. It may cause:
You will be asked about your child's symptoms and health history. A physical exam will be done. This is often enough to make the diagnosis. More tests may be done to find the cause of the fever.
Febrile seizures go away as children get older. The goal of treatment is to manage the fevers that cause them. This can be done with medicines, such as antibiotics.
A rectal valium gel may be used in children who have repeat seizures.
There are no guidelines to prevent febrile seizures.
Healthy Children—American Academy of Pediatrics
Caring for Kids—Canadian Paediatric Society
Febrile seizure. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/febrile-seizure . Updated November 30, 2018. Accessed January 6, 2020.
Febrile seizures: what every parent should know. Family Doctor—American Academy of Family Physicians website. Available at:
...(Click grey area to select URL)
Updated March 1, 2014. Accessed January 6, 2020.
Kimia AA, Bachur RG, et al. Febrile seizures: emergency medicine perspective. Curr Opin Pediatr. 2015 Jun;27(3):292-297.
Febrile seizures fact sheet. National Institute of Neurological Disorders and Stroke website. Available at: https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Febrile-Seizures-Fact-Sheet#3111. Updated August 13, 2019. Accessed January 6, 2020.
Last reviewed September 2019 by EBSCO Medical Review Board Kari Kassir, MD
Last Updated: 1/6/2020
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