Febrile Seizures



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.

Risk Factors

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:

  • Family history of febrile seizures
  • Developmental delay problems
  • Having a viral infection
  • Recent immunization



A seizure often lasts a few seconds up to 15 minutes. It may cause:

  • Fever
  • Convulsion—jerking or stiffening muscles
  • Eye rolling
  • Loss of consciousness
  • Loss of bladder or bowel control
  • Vomiting


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.

MRI Scan
MRI of the Brain
Copyright © Nucleus Medical Media, Inc.



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.

  • Antibiotics to treat infection
  • Acetaminophen to lower the fever

A rectal valium gel may be used in children who have repeat seizures.


There are no guidelines to prevent febrile seizures.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.

a (Fever Seizures)


Epilepsy Foundation http://www.epilepsyfoundation.org 

Healthy Children—American Academy of Pediatrics http://www.healthychildren.org 


Caring for Kids—Canadian Paediatric Society http://www.caringforkids.cps.ca 

Health Canada https://www.canada.ca 


Febrile seizure. EBSCO DynaMed website. Available at:  https://www.dynamed.com/condition/febrile-seizure . Updated November 30, 2018. Accessed January 6, 2020.

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.

Febrile seizures: what every parent should know. Family Doctor—American Academy of Family Physicians website. Available at: http://familydoctor.org/familydoctor/en/diseases-conditions/febrile-seizures.html. 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.