Febrile Seizures

Overview

Febrile seizures are convulsions that can happen in young children when they have a fever. They are usually seen between infancy and early childhood and are often related to a rapid rise in body temperature. Although febrile seizures can look frightening, most are brief and do not cause long-term harm.

During a febrile seizure, a child may lose awareness, become stiff, have jerking movements of the arms and legs, or roll their eyes. The seizure usually stops on its own within a short time. Febrile seizures are different from epilepsy, which involves repeated seizures not caused by fever. However, any seizure in a child should be discussed with a healthcare professional to confirm the cause and decide whether further evaluation is needed.

Symptoms

The main symptom is a seizure occurring with a fever. The fever may be due to a common childhood infection, and in some cases the seizure is the first sign that the child is unwell.

• Sudden loss of consciousness or reduced responsiveness
• Stiffening of the body
• Rhythmic jerking or shaking movements
• Eye rolling or fixed staring
• Brief breathing changes or bluish color around the lips
• Sleepiness, confusion, or crying after the seizure ends

Febrile seizures are often grouped as simple or complex. A simple febrile seizure is brief, affects the whole body, and does not happen again within the same illness. A complex febrile seizure may last longer, affect one side of the body, or occur more than once during the same fever episode. Complex features require closer medical assessment.

Causes and Risk Factors

Febrile seizures are triggered by fever, commonly from viral or bacterial infections. The exact reason some children have febrile seizures is not fully understood, but the developing brain appears to be more sensitive to fever in certain children.

Possible risk factors include:

• Age, especially in young children
• A family history of febrile seizures
• Fever that rises quickly
• Previous febrile seizure
• Certain childhood infections that cause high fever

Febrile seizures are not caused by crying, teething alone, or minor temperature changes without illness. They are also not the result of something parents did wrong. In most children, febrile seizures occur only during a limited period of early childhood and become less likely as the child grows.

Diagnosis

Diagnosis is based on the child’s age, symptoms, fever history, physical examination, and the details of the seizure. The doctor will ask how long the seizure lasted, what movements were seen, whether the child was responsive, whether one side of the body was more affected, and how the child recovered afterward.

The most important part of the evaluation is identifying the cause of the fever and making sure there are no signs of a serious infection or another condition. In many children with a typical febrile seizure and a clear source of fever, extensive testing may not be needed. Depending on the child’s condition, age, examination findings, and medical history, the doctor may recommend blood tests, urine tests, imaging, or tests to look for infection. In selected cases, an electroencephalogram may be considered, especially if the seizure features are unusual.

Parents and caregivers can help by noting the time the seizure started and ended, describing what happened, and mentioning any recent illness, vaccinations, medications, or previous seizures. A video of the event, if safely obtained, may also help the healthcare team understand the seizure pattern.

Treatment Options

Treatment focuses on the child’s safety during the seizure, assessment after the event, and care for the illness causing the fever. Most febrile seizures stop on their own before emergency treatment is needed. After a seizure, the child should be checked by a healthcare professional, especially if it is the first seizure or if there are any concerning features.

Fever comfort measures may be recommended by a doctor, but fever control does not always prevent another febrile seizure. Parents should avoid giving any medicine without guidance, especially in infants or children with other medical conditions. The underlying cause of fever may need specific treatment depending on the diagnosis.

Children who have had complex febrile seizures, repeated events, or other neurological concerns may be referred to a pediatric neurologist for further evaluation. In some situations, families may be given an emergency plan by their doctor for future seizures. This plan should be individualized and clearly explained by the healthcare team.

Long-term daily treatment is not usually needed for children with simple febrile seizures. Follow-up helps ensure the child is developing well and allows parents to ask questions about what to expect if fever occurs again.

When to See a Doctor

Seek urgent medical help if a child has a seizure with fever, especially if it is the first seizure. Emergency care is particularly important if the seizure lasts longer than a few minutes, breathing seems difficult, the child does not wake up or return to usual behavior, the seizure affects only one side of the body, or another seizure happens during the same illness.

Medical attention is also needed if the child is very young, has a stiff neck, persistent vomiting, severe headache, unusual rash, signs of dehydration, extreme sleepiness, or if caregivers are worried about the child’s condition. Even when a febrile seizure appears typical and the child recovers well, a doctor should evaluate the fever source and provide guidance for future episodes.

Febrile seizures can be alarming, but most children recover fully from the seizure itself. Prompt assessment and clear advice from a pediatric healthcare team can help families feel prepared and reassured.