The American Academy of Pediatrics – Febrile Seizures in Children explains that a febrile seizure is a seizure that happens in a young child around the time of a fever. For a parent or caregiver, it can be one of the most frightening things to witness: a child may suddenly become stiff, shake, lose consciousness, roll their eyes, or stop responding for a short time. The reassuring part is that most febrile seizures are brief, stop on their own, and do not cause brain damage or long-term developmental problems. Febrile seizures are most common between 6 months and 5 years of age. The American Academy of Pediatrics (AAP) estimates that they occur in about 3 or 4 out of every 100 children, most often around 12 to 18 months. They can happen early in a febrile illness, sometimes before a parent even realizes that the child has a fever.
The important questions are not simply “How high was the fever?” but also “How long did the seizure last?”, “Did it affect the whole body or only one side?”, “Did it happen more than once?”, and “How did the child behave afterward?” Those details help clinicians distinguish a typical simple febrile seizure from a more complicated event that may need additional evaluation. If a child is having a seizure for the first time, has difficulty breathing, has a seizure lasting more than five minutes, or does not recover as expected, seek emergency medical care. This article is general information and is not a substitute for individualized medical advice.
Recognizing Febrile Seizures
What Is a Febrile Seizure? A febrile seizure is a seizure associated with fever in a young child who does not have a central nervous system infection, a major metabolic cause for the seizure, or a known history of unprovoked seizures that would better explain the event. In everyday language, it is a seizure that occurs because a young child’s developing nervous system is particularly susceptible to fever. The fever may come from a common viral or bacterial illness. A febrile seizure is not the same thing as epilepsy, and a child does not automatically have epilepsy because a seizure occurred during a fever. Many febrile seizures happen during the first few hours of an illness. They are often associated with fevers around 102°F (38.9°C) or higher, but they can occur at lower temperatures as well. There is no single temperature at which every child will have a seizure.
How Common Are Febrile Seizures? Febrile seizures are among the most common seizure events in childhood. The AAP reports that approximately 3% to 4% of children experience one, while the U.S. Centers for Disease Control and Prevention (CDC) notes that up to 5% of young children may have a febrile seizure at some point. They are most common between 6 months and 5 years of age, especially during the second year of life. A family history also matters. Febrile seizures tend to run in families, suggesting that genetics influence how susceptible a child’s nervous system is to fever-related seizures. What Does a Febrile Seizure Look Like? A febrile seizure can look dramatic even when it is medically uncomplicated. During a typical generalized seizure, a child may: Suddenly lose consciousness or stop responding. Become stiff. Develop rhythmic shaking or jerking of the arms and legs. Roll the eyes upward. Clench the jaw. Drool or have increased saliva. Have temporary changes in breathing or skin color. Urinate or vomit during the event.
After the seizure stops, the child may be sleepy, confused, irritable, or exhausted for a short period. This post-seizure phase is called the postictal period. In a typical simple febrile seizure, the child gradually returns to their usual behavior. Parents often describe a one- or two-minute seizure as feeling much longer. That is why one of the most useful things a caregiver can do is look at a clock or start a timer as soon as the seizure begins. Simple vs. Complex Febrile Seizures Clinicians commonly divide febrile seizures into simple and complex types. The distinction matters because it helps determine how much evaluation a child may need.
| Feature | Simple febrile seizure | Complex febrile seizure |
|---|---|---|
| Body involvement | Generalized, involving the whole body | May be focal or affect mainly one side/body area |
| Duration | Less than 15 minutes | 15 minutes or longer |
| Frequency | Occurs once within 24 hours | May recur within 24 hours |
| Recovery | Usually returns toward baseline relatively quickly | Recovery may be slower or accompanied by focal weakness |
Most febrile seizures are simple. A complex febrile seizure is not automatically a sign of permanent brain injury, but it deserves a more individualized medical assessment because prolonged, focal, or repeated seizures can overlap with other neurologic conditions.
What Parents Should Do During and After a Seizure
What Should You Do During a Febrile Seizure? The NHS – Febrile Seizures guidance reinforces the same immediate priorities: protect the child from injury, do not restrain them, do not put anything in the mouth, and seek urgent help when the seizure is prolonged or otherwise concerning. The first goal is to prevent injury and protect the child’s airway. You cannot safely “stop” a seizure by holding the child down, and nothing should be placed in the child’s mouth. Note the time. Start timing the seizure immediately. Move hazards away. Clear nearby furniture, toys, or sharp objects. Place the child on a safe surface. A floor, bed, or other flat area away from hard edges is appropriate. Turn the child to the side when possible. This helps saliva or vomit drain from the mouth. Protect the head. Place something soft underneath or use your hands to prevent the head from striking a hard surface. Loosen tight clothing around the neck. Do not restrict breathing. Do not restrain the child’s movements. Do not put fingers, a spoon, medicine, food, or any other object in the child’s mouth. A child cannot swallow their tongue. Watch breathing and skin color. Stay with the child until the seizure stops and recovery begins. If the seizure continues for more than five minutes, call 911 or your local emergency number. Longer seizures are less likely to stop quickly on their own and may require rescue medication administered by emergency personnel or according to a clinician-provided seizure plan. When Is a Febrile Seizure an Emergency? Any first seizure in a child should receive prompt medical assessment. Emergency help is especially important when:
The seizure lasts more than five minutes. The child has trouble breathing or remains blue or gray. The seizure affects only one side or one part of the body. Another seizure occurs within 24 hours. The child remains unusually sleepy, confused, weak, or difficult to wake after the seizure. There are signs of meningitis or another serious infection, such as severe neck stiffness, a concerning rash, persistent altered mental status, or a very ill appearance. The child is younger than the typical febrile-seizure age range. The seizure followed a head injury, possible poisoning, or another event that could explain it. Do not drive a child who is actively seizing to the emergency department. Call emergency services so trained personnel can protect the airway and give medication if the seizure continues.
Why Febrile Seizures Happen and How They Are Evaluated
What Causes Febrile Seizures? Febrile seizures can occur with many illnesses that cause fever. Common triggers include viral respiratory infections, influenza, roseola, ear infections, and other childhood infections. The seizure appears to result from an interaction between fever, a developmentally susceptible nervous system, and individual factors such as genetics. It is not simply a matter of the fever becoming “dangerously high.” Some children have febrile seizures at relatively modest temperatures, while many children with very high fevers never have a seizure. A seizure can also happen very early in an illness, sometimes before the fever has been detected. This is one reason a parent may initially believe the seizure came “out of nowhere.” Does a Rapid Rise in Temperature Cause the Seizure? Parents are sometimes told that febrile seizures happen because the temperature rose too quickly. Modern guidance is more cautious. The exact mechanism is not fully understood, and seizure susceptibility varies from child to child. Both the child’s age and the fever-producing illness matter.
The practical point is that parents should not blame themselves for failing to “catch” a fever soon enough. Even careful temperature monitoring and prompt use of fever-reducing medicine cannot reliably prevent a febrile seizure. How Are Febrile Seizures Diagnosed? The NCBI Bookshelf – Febrile Seizure review provides clinical context for distinguishing simple from complex events and for deciding when the child’s age, examination, seizure pattern, or signs of the underlying illness justify additional evaluation. Diagnosis begins with the history of the event and a physical examination. Clinicians want to know: The child’s age. How high the temperature was and when the fever began. How long the seizure lasted. Whether the whole body or only one part was involved. Whether more than one seizure occurred. How quickly the child returned to normal. Recent illnesses and symptoms. Vaccination history. Previous seizures. Developmental history. Family history of febrile seizures or epilepsy. Possible exposure to medicines, toxins, or head injury.
For a well-appearing child with a classic simple febrile seizure, routine brain imaging, electroencephalography (EEG), and broad laboratory testing are generally not needed solely because the seizure occurred. The medical evaluation is directed mainly toward identifying the cause of the fever and ruling out serious conditions when the history or examination raises concern. A child with a complex seizure, persistent abnormal neurologic findings, signs of meningitis, unusual age, or another concerning feature may need additional tests. Depending on the situation, these may include blood or urine testing, lumbar puncture, EEG, or neuroimaging.
Recurrence, Epilepsy Risk and Long-Term Outlook
Do Febrile Seizures Cause Brain Damage? Typical short febrile seizures do not cause brain damage. The AAP states that most febrile seizures do not cause paralysis, intellectual disability, nervous-system injury, or death. This is an important correction to an understandable fear. The seizure can look severe because of the shaking and loss of consciousness, but appearance alone does not mean the brain is being permanently injured. Prolonged seizures are treated more urgently because seizure duration matters clinically. That is another reason caregivers should time the event rather than estimating afterward. Will a Child Have Another Febrile Seizure? Recurrence is fairly common. The CDC estimates that about 1 in 3 children who have a febrile seizure will have at least one more during childhood. Age at the first seizure changes the probability. The AAP notes that children younger than 1 year at their first febrile seizure have roughly a 50% chance of another episode, while otherwise healthy children older than 1 year have about a 30% chance of a second febrile seizure. Recurrence does not mean the child’s condition is progressively worsening. Most children outgrow the tendency by school age.
Do Febrile Seizures Lead to Epilepsy? Febrile seizures and epilepsy are different conditions. Most children with febrile seizures do not go on to develop epilepsy. The long-term risk of epilepsy is only slightly higher overall than in children who have never had a febrile seizure. Risk is greater when other factors are present, such as complex febrile seizures, abnormal neurodevelopment, or a family history of epilepsy. Parents who notice developmental concerns after any significant childhood illness should discuss them with a pediatrician. MyArticles also has a broader guide to childhood development, milestones, learning, and early support.
Treatment, Prevention and Vaccine Questions
Can Fever Medicine Prevent Another Febrile Seizure? Acetaminophen (paracetamol) or ibuprofen may make a child more comfortable when they have a fever, but fever-reducing medicines have not been shown to reliably prevent febrile seizures. Parents should use these medicines according to age-appropriate dosing instructions and medical advice rather than giving extra doses in an attempt to prevent a seizure. Aspirin should not be given to children or teenagers with viral illnesses unless a clinician specifically directs its use because of the risk of Reye syndrome. Cold baths, ice, aggressive sponging, or removing excessive clothing to force the temperature down are not seizure-prevention strategies and can make a child uncomfortable. Do Children Need Daily Anti-Seizure Medicine? Most children with simple febrile seizures do not need daily preventive anti-seizure medication. The potential adverse effects of long-term medication generally outweigh the benefit for an otherwise healthy child with brief, uncomplicated febrile seizures. For children who have prolonged or repeated seizures, a clinician may prescribe a rescue medication to be used if another seizure lasts beyond a specified time. Families who receive such medication should be taught exactly when and how to use it and when to call emergency services.
Can Vaccines Cause Febrile Seizures? Vaccines can sometimes cause fever, and there is a small increased risk of febrile seizures after certain vaccines or vaccine combinations. However, febrile seizures after vaccination are uncommon, and recommended vaccination can also prevent febrile seizures by protecting children against infections such as measles, mumps, rubella, chickenpox, influenza, and pneumococcal disease that can themselves cause fever. The CDC reports a small increased risk after the first measles, mumps, and rubella (MMR) vaccine, typically several days after vaccination. For children receiving their first measles-containing vaccine in the second year of life, the combined MMRV vaccine has a somewhat higher short-term febrile-seizure risk than giving MMR and varicella vaccines separately. The absolute risk remains small. The Centers for Disease Control and Prevention – Febrile Seizures and Vaccines notes that vaccines carry substantially greater health risks.
Common Myths and a Practical Parent Plan
Common Myths About Febrile SeizuresMyth: A child can swallow their tongue during a seizure
They cannot. Putting an object or fingers into the mouth can cause dental injury, choking, or injury to the caregiver. Myth: You should hold the child still Do not restrain a child who is convulsing. Clear the area and protect the head instead. Myth: Every seizure with fever is a simple febrile seizure No. Meningitis, encephalitis, metabolic problems, poisoning, epilepsy, and other conditions can also cause seizures in a child who happens to have a fever. Medical assessment is especially important after a first seizure or when features are atypical. Myth: A very high fever guarantees a seizure No. Most children with fever never have a febrile seizure, even when the temperature is high.
Myth: Fever medicine guarantees prevention No. Acetaminophen and ibuprofen are useful for comfort, but they do not reliably stop febrile seizures from occurring. Myth: A febrile seizure means the child has epilepsy No. The great majority of children with febrile seizures never develop epilepsy. How Parents Can Prepare After a First Febrile Seizure After the immediate medical evaluation, parents usually benefit from having a simple plan for the next fever.
Know basic seizure first aid. Keep the local emergency number readily available. Ask the pediatrician exactly when to seek emergency care. If rescue medication is prescribed, learn how and when to give it. Tell regular caregivers, relatives, daycare staff, or school personnel about the child’s history. Do not skip routine vaccination because of fear unless the child’s healthcare professional gives a specific medical reason. Keep a short record of any future seizure, including duration, fever, body areas involved, and recovery time.
A video can sometimes help clinicians understand an unusual event, but only if another adult can record it safely while someone else protects the child. Safety always comes first.
Conclusion
A febrile seizure is frightening, but the typical simple febrile seizure is brief and has an excellent prognosis. The most useful actions are practical: keep the child safe, place them on their side when possible, never put anything in the mouth, time the seizure, and get emergency help if it lasts more than five minutes or has other concerning features. After the event, the focus shifts to finding the cause of the fever and determining whether the seizure was simple or complex. Most children do not need long-term anti-seizure treatment, and most do not develop epilepsy or lasting neurologic problems. This article is for general educational purposes. A seizure in a child should be medically assessed, and emergency symptoms require immediate professional care.