Seizures in children are caused by abnormal electrical activity in the brain, triggered by factors such as fever, infections, head injuries, genetic conditions, metabolic imbalances, or underlying brain abnormalities. In many cases, especially in children, the exact cause may not be identified.
Quick Key Takeaways
- Fever is one of the most common causes in young children (febrile seizures)
- Brain-related issues (injury, infection, developmental problems) are major causes
- Metabolic problems (low sugar, electrolyte imbalance) can trigger seizures
- Some children have epilepsy, where seizures recur without a clear trigger
- In many cases, the cause remains unknown
“Anything that disrupts normal brain signals can trigger a seizure.”
What Causes Seizures in Children?
Seizures happen when brain cells send abnormal electrical signals, interrupting normal brain function.
Below are the most common causes grouped by category.
1. Fever (Febrile Seizures)
- Most common in children aged 6 months to 5 years
- Triggered by a rapid rise in body temperature
- Often linked to infections like colds or flu
“In children, infections with fever are a leading cause of seizure emergencies.”
These seizures are usually short and may not lead to long-term epilepsy.
2. Brain Infections
Infections that affect the brain or surrounding tissues can trigger seizures:
- Meningitis (infection of brain lining)
- Encephalitis (brain inflammation)
These conditions disrupt brain activity and may cause both short-term and long-term seizures.
3. Head Injury or Trauma
- Falls, accidents, or trauma can damage brain tissue
- Even mild concussions may trigger seizures
Brain injury can interrupt normal electrical pathways and lead to seizures.
4. Developmental Brain Abnormalities
Some children are born with structural differences in the brain.
Examples include:
- Cortical dysplasia (abnormal brain development)
- Congenital malformations
These can cause recurrent seizures or epilepsy.
“Developmental brain changes are a common cause of seizures in children.”
5. Genetic Causes
- Some seizure disorders are inherited
- Genetic syndromes can affect how brain cells function
In some cases, no visible brain abnormality is found, but genetics plays a role.
6. Metabolic and Chemical Imbalances
Seizures can occur when the body’s chemistry is disrupted:
- Low blood sugar (hypoglycaemia)
- High or low sodium levels
- Calcium imbalance
“High or low blood sugar and other imbalances can trigger seizures.”
These seizures often stop once the imbalance is corrected.
7. Lack of Oxygen (Perinatal Causes)
- Complications during birth
- Reduced oxygen supply to the brain
This can lead to brain injury and increase seizure risk later in life.
8. Brain Tumours or Structural Lesions
Although less common, seizures may be caused by:
- Brain tumours
- Scar tissue from previous injury or infection
These disrupt normal brain signalling and may cause repeated seizures.
9. Epilepsy (Recurrent Seizures)
- Diagnosed when a child has two or more unprovoked seizures
- Can be caused by genetic, structural, or unknown factors
In many children, epilepsy has no identifiable cause.
10. Unknown Causes (Idiopathic)
In a significant number of cases:
- No clear cause is found
- The child may still have seizures or epilepsy
“About 6 in 10 epilepsy cases have no known cause.”
Summary Table: Causes of Childhood Seizures
| Cause Category | Examples | Typical Outcome |
| Fever | Febrile seizures | Often temporary |
| Infections | Meningitis, encephalitis | May require urgent care |
| Injury | Head trauma | Depends on severity |
| Brain abnormalities | Congenital defects | May cause epilepsy |
| Genetic | Inherited conditions | Varies |
| Metabolic | Low blood sugar, electrolytes | Usually reversible |
| Oxygen deprivation | Birth complications | May cause long-term issues |
| Tumours | Brain lesions | Requires specialist care |
| Epilepsy | Recurrent seizures | Long-term management |
| Unknown | Idiopathic | Common in children |
When to Seek Immediate Help
Call emergency services immediately if:
- A seizure lasts more than 5 minutes
- The child has trouble breathing
- It’s the first seizure
- The child is injured during the seizure
“A seizure lasting more than five minutes is a medical emergency.”
Final Insight
Childhood seizures are not a single condition—they are a symptom with many possible causes. Some are temporary and harmless, while others require long-term management.
“The key to managing seizures in children is identifying the underlying cause and responding early.”