Skip to Content

Febrile Seizures

Medically reviewed on July 21, 2017

What Is It?

Harvard Health Publications

Febrile seizures occur in children. They are caused by a high fever or by a sudden rise in body temperature. These seizures usually happen at the beginning of an illness, soon after the fever first starts. Febrile seizures affect about 3-5 percent of children. They are most common between ages 6 months and 5 years.

What is a seizure? The brain's nerve cells (neurons) communicate with each other by giving off tiny electric signals. When someone has a seizure (convulsion), the way the brain's nerve cells give off signals suddenly changes, causing different muscles in the body to twitch or jerk uncontrollably.

Febrile Seizures

More than one in three children who have had a febrile seizure will have another one within one year. But most children eventually grow out of this condition. The risk of having another seizure is greater in children:

  • With a family history of febrile seizures

  • Who had their first seizure when they were younger than 12 months old

Children who have delays in normal development are also more likely to have seizures with fever.


Signs of a febrile seizure may include:

  • Jerky, twitching movements of the arms and legs

  • Stiffness

  • Rolling eyes

  • Passing out (loss of consciousness)

  • Not responding to voices or touch


In most cases, a doctor can diagnose febrile seizures based on a description of the episode. However, the doctor may want to see your child to look for the cause of the fever. In particular, the doctor will want to make sure your child does not have any signs of a serious infection of the brain (encephalitis) or of the coverings of the brain and spinal cord (meningitis).

Expected Duration

Febrile seizures usually last less than 5 minutes. If they last longer than this, call your doctor right away.


There is no way to prevent the first febrile seizure. In children who already have had one febrile seizure, parents should be taught how to best manage a fever and a seizure if it occurs. Preventing high temperatures will decrease the risk of febrile seizures. Also parents should be reassured that febrile seizures are rarely harmful if they last only a few minutes.

Some medications may help to prevent more seizures. However, the potential side effects of these drugs may be worse than the benefits. Therefore, they are rarely prescribed.


You cannot stop a seizure once it starts, but you can do the following to protect your child:

  • Try to stay calm.

  • Place the child on his or her side or stomach on a safe, flat surface, such as the floor. Keep the child away from furniture or objects that may cause injury.

  • Tilt your child's head to the side to prevent choking.

  • Do not restrain your child or put anything between his or her teeth.

  • Observe your child carefully so you can describe the events to your doctor.

  • Keep track of the time. If the seizure lasts longer than about five minutes, call your doctor.

After a seizure, call your doctor to arrange an appointment so your child can be examined, if necessary.

Treatment involves reducing the fever and treating whatever is causing the fever. Hospitalization usually is not necessary, unless the condition causing the fever requires it.


The outlook is excellent. Febrile seizures generally are not harmful and do not cause long-term problems. Children with cerebral palsy, developmental delays or certain neurological problems are slightly more likely than other children to develop epilepsy (repeated seizures that are not related to fevers) after febrile seizures. Children who have repeated febrile seizures are at an increased risk of developing epilepsy. However, the risk is still very low.

External resources

American Academy of Pediatrics (AAP)
141 Northwest Point Blvd.
Elk Grove Village, IL 60007-1098
Phone: 847-434-4000
Fax: 847-434-8000

Epilepsy Foundation
4351 Garden City Drive
Landover, MD 20785-7223
Toll-Free: 1-800-332-1000

National Institute of Neurological Disorders and Stroke
P.O. Box 5801
Bethesda, MD 20824
Phone: 301-496-5751
Toll-Free: 1-800-352-9424
TTY: 301-468-5981

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.