How do I tell a febrile seizure from a real seizure?
Febrile seizures ARE real seizures, not a lesser category, but they're a specific type triggered by fever in young children who don't have epilepsy. The key differences from a seizure caused by epilepsy are the presence of fever, the child's age, and whether it's a one-off simple event or shows 'complex' features that raise the chance of an underlying seizure disorder.
Doctors distinguish 'simple' febrile seizures (brief, one per illness, whole-body) from 'complex' ones (focal, over 15 minutes, or more than one in 24 hours), with complex features raising the odds of later epilepsy.
Good
Based on Canadian paediatric society patient guidance and a peer-reviewed pediatric neurology review; these are clinical definitions and expert consensus rather than a single controlled trial, but they are consistent across sources.
What the evidence says
A febrile seizure is a genuine seizure, not a milder look-alike, it's just one that's specifically triggered by a fever in a child aged roughly 6 months to 5 years, with no brain infection, past afebrile seizure, or other explanation for it. During one, a child's body stiffens, their eyes may roll up, and their limbs jerk, sometimes with brief loss of consciousness, usually lasting 30 seconds to 2 minutes. Doctors split febrile seizures into 'simple' (happens once during the illness, lasts under 15 minutes, and involves the whole body) and 'complex' (one-sided/focal, lasts over 15 minutes, or repeats within 24 hours).
Complex features, or a seizure lasting more than 30 minutes without full recovery in between (status epilepticus), make a work-up for other causes more likely and slightly raise, but don't guarantee, the chance of epilepsy later. A few things get mistaken for seizures during a fever: shivering chills (the child stays fully conscious and it's mainly shaking, without eye-rolling or loss of awareness), and febrile delirium (confusion with fever but no jerking limbs or eye rolling). If your child stays aware and responsive throughout the shaking, it's more likely chills than a seizure.
A febrile seizure does not mean your child has, or will develop, epilepsy. Still, any first seizure, or one lasting longer than a few minutes, should be checked by a doctor to rule out serious causes like meningitis, and a seizure lasting more than 5 minutes without stopping is a medical emergency requiring an ambulance.
Sources
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Guideline
Febrile seizures
Canadian Paediatric Society - Caring for Kids
Describes what a febrile seizure looks like and basic first aid.
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Guideline
Febrile seizures (seizures occurring with fever)
AboutKidsHealth (SickKids)
Explains simple vs complex febrile seizures and when to call an ambulance.
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Guideline
Febrile seizures (fever seizures)
HealthLink BC
Confirms febrile seizure doesn't mean epilepsy; CPS-based first aid steps.
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Guideline
Types of seizures
AboutKidsHealth (SickKids)
Places febrile seizures among 'provoked' seizures, distinct from epilepsy.
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Systematic review
Febrile seizures: an overview
Drugs in Context (PMC/NIH)
Details how to tell febrile seizures apart from chills, delirium, other mimics.
✓Reviewed by CH, MD, FRCPC
Reviewed by a specialist physician certified by the Royal College of Physicians and Surgeons of Canada, who has read this answer against the sources listed above and confirmed it reflects them. That is not medical advice about your child. How we review
Answer checked August 2, 2026