A febrile convulsion in a previously well child is one of the most frightening experiences a parent can witness — a child goes rigid, loses consciousness, shakes or jerks uncontrollably, and is completely unresponsive for what can feel like an eternity. The good news — and it is genuine good news — is that simple febrile convulsions, the most common type, are almost always brief, self-terminating, and do not cause brain damage or predict epilepsy. The challenge for parents is knowing this in the moment and knowing what to do.
Understanding what febrile convulsions are, why they happen in this age group, how to manage one when it occurs, and what follow-up is needed helps parents be prepared — which meaningfully reduces the chaos and panic when one occurs.
Healthbooq provides parents with safety and first aid guidance for common acute medical events in young children, including febrile convulsions.
What Febrile Convulsions Are
A febrile convulsion (also called a febrile seizure) is a seizure that occurs in the context of a fever in a child between six months and five years of age, in the absence of a central nervous system infection or other identifiable cause for the seizure. The seizure is triggered not by the height of the fever per se, but by the rapid rise in body temperature — which is why the convulsion may be the first indication that the child is becoming febrile.
Simple febrile convulsions last less than fifteen minutes (most last less than five), affect the whole body (generalised), and do not recur within the same illness episode. Complex febrile convulsions last longer than fifteen minutes, are focal (one-sided), or recur within twenty-four hours; these are less common and warrant more thorough investigation.
Why They Happen
The developing brains of young children between six months and five years are more susceptible to seizure activity in the context of fever than older children or adults. The mechanism is not fully understood but involves the effect of rapidly rising temperature on neuronal excitability. Children with a family history of febrile convulsions have a higher risk — the condition has a genetic component. Most children who have a febrile convulsion do not go on to develop epilepsy; the risk of subsequent epilepsy is only marginally higher than in the general population after a simple febrile convulsion.
Approximately one in three children who have one febrile convulsion will have another with a subsequent febrile illness. The risk of recurrence is higher in younger children (under eighteen months at first convulsion), those with a lower temperature threshold for convulsion, and those with a family history.
What to Do During a Febrile Convulsion
The management of a febrile convulsion in the moment follows the same priority framework as any seizure: protect the child from injury, time the seizure, do not restrain them, do not put anything in their mouth, and place them on their side (recovery position) if possible.
Do not attempt to stop the convulsion by restraining movements or putting anything in the child's mouth — the most common myths about seizure first aid involve both of these. The child will not "swallow their tongue," and restraint does not stop the seizure and risks injury.
Call 999 if: the seizure lasts more than five minutes (diazepam may need to be administered); you cannot be certain whether it is a febrile convulsion or another type of seizure; or the child does not return to normal responsiveness within thirty minutes of the seizure ending.
After the convulsion ends, the child will typically be drowsy and confused for a period (the post-ictal phase) before gradually recovering. All children who have a first febrile convulsion should be assessed by a doctor, even if they have fully recovered — to confirm the diagnosis, identify the source of fever, and provide guidance for future events.
Key Takeaways
Febrile convulsions — seizures triggered by fever in children aged six months to five years — are common, affecting approximately one in thirty children. They are terrifying to witness but, in their simple form, are almost always brief (under five minutes), self-limiting, and not associated with brain damage or epilepsy. A child who has a febrile convulsion should be assessed by a doctor after the event, but the seizure itself is managed by keeping the child safe, timing the seizure, and calling 999 if it lasts more than five minutes.
