Febrile Seizure: Symptoms & Signs

Medically Reviewed on 8/26/2020

Febrile seizures are convulsions (seizures) that occur in association with a fever. They are relatively common in infants and young children and do not mean that the child has a seizure disorder. About 1 in every 25 children will experience a febrile seizure at some point.

Signs and symptoms of a febrile seizure can vary. They may include

  • convulsions,
  • shaking, and
  • twitching all over the body or on one side.

Other associated symptoms and signs can include

Most febrile seizures last for 1-2 minutes, although they may be shorter or last for several minutes.

Cause of febrile seizures

The cause of the fever may be due to various conditions, including a viral infection like the flu (influenza) or a bacterial infection.

Other febrile seizure symptoms and signs

  • Convulsions
  • Loss of Consciousness (Passing Out)
  • Moaning or Grunting
  • Shaking
  • Twitching All Over the Body or on One Side
  • Urinating During the Seizure
  • Vomiting


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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.