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Febrile Seizures

Medically reviewed by Last updated on Jul 11, 2022.

What are Febrile Seizures?

Harvard Health Publishing

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 on a safe, flat surface, such as the floor. Keep the child away from furniture or objects that may cause injury.
  • 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 five minutes, call 911

After a seizure, call your doctor for advice

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.

Additional Info

American Academy of Pediatrics (AAP)

Epilepsy Foundation

National Institute of Neurological Disorders and Stroke

Further information

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