Last updated 28 October 2026 · 8 min read · By Sarah M., Support Coordinator
In short
Epilepsy Action Australia lists causes including head injury, stroke or brain haemorrhage, lack of oxygen to the brain, brain infections, brain tumours, brain abnormalities present at birth and genetic factors. In about half of people diagnosed, the cause is never known (Epilepsy Action Australia).
This guide explains how epilepsy occurs, what the main causes are and what to ask your doctor. For the basics, start with what epilepsy is.
Key points
Epilepsy has several known causes, including head injury, stroke, brain infection, brain tumour, lack of oxygen, differences present at birth and genetic factors.
In about half of people diagnosed, the cause is never known, according to Epilepsy Action Australia.
Only a doctor or specialist can say what is behind a person’s epilepsy, and tests do not always find an answer.
Questions about memory, mood, prevention or age of onset are best taken to a GP, neurologist or paediatrician.
What can cause epilepsy at a glance
What it is
A condition where the brain can produce seizures; causes vary between people
Known causes
Head injury, stroke or brain haemorrhage, lack of oxygen to the brain, brain infections, brain tumours, brain abnormalities present at birth and genetic factors
Cause unknown
About half of people diagnosed never learn the cause (Epilepsy Action Australia)
Who can assess it
Your GP, who can refer you to a neurologist or paediatrician
NDIS relevance
Support depends on how epilepsy affects daily life, if you meet the NDIS access requirements
Official source
Epilepsy Action Australia and Epilepsy Foundation
What can cause epilepsy?
Epilepsy is the name for a tendency to have seizures, and many different things can lead to it.
Head injury: an injury to the head is on Epilepsy Action Australia’s list of causes.
Stroke or brain haemorrhage: bleeding in or a blocked blood supply to the brain can be a cause.
Lack of oxygen: a period without enough oxygen reaching the brain is listed as a cause.
Brain infections and tumours: both appear on the same list of causes.
Present from birth or inherited: brain abnormalities present at birth and genetic factors are also listed.
Causes of acquired epilepsy include these events
Acquired epilepsy develops after something affects the brain, rather than being present from birth.
Cause
Plain-language meaning
Who to ask
Head injury
An injury to the head that affects the brain
GP or neurologist
Stroke
A problem with blood supply to part of the brain
GP or neurologist
Brain haemorrhage
Bleeding in the brain
GP or neurologist
Lack of oxygen
Not enough oxygen reaching the brain
Treating hospital team or neurologist
Brain infection
An infection that affects the brain
GP or neurologist
Brain tumour
A growth in or near the brain
Treating specialist
Each of these is on Epilepsy Action Australia’s list of causes. Your doctor can explain which, if any, may apply to you.
Post traumatic epilepsy and acquired epilepsy causes
Post traumatic epilepsy is epilepsy that follows an injury to the head.
After an injury: if seizures begin after a head injury, tell your GP or neurologist about the injury, when it happened and what care you had.
Keep records: hospital letters, scan reports and rehabilitation notes help a specialist build the picture.
Not every injury leads to epilepsy: ask your doctor about your own situation instead of relying on general lists.
Other acquired causes: stroke, infection and lack of oxygen follow the same approach, so keep every relevant report.
Wider reading: our guide to focal epilepsy explains one type of epilepsy in more detail.
Looking for NDIS support at home?
TQN Care support workers help with personal care, community access, respite and help around the home across Sydney, Melbourne and surrounding areas (NSW & VIC). Tell us what you need and we will call you back.
Seek advice early rather than waiting, and call 000 in an emergency.
You or someone you care for has a first seizure or something that might have been a seizure.
Seizures change in how often, how long or how they look.
Seizures begin after a head injury, stroke, infection or illness.
Memory, mood or behaviour changes worry you or your family.
You want a seizure management plan for home, school, work or a new support worker.
Looking for NDIS support at home?
TQN Care support workers help with personal care, community access, respite and help around the home across Sydney, Melbourne and surrounding areas (NSW & VIC). Tell us what you need and we will call you back.
If epilepsy affects daily life for you or someone you care for, practical support can help at home and in the community. At TQN Care, our high-care and complex support team works with families to follow each person’s seizure plan, never to give treatment. Send us a referral and we will talk through what support could look like.
SM
Sarah M., Support CoordinatorTQN Care is a registered NDIS provider supporting people across Sydney, Melbourne and surrounding areas (NSW & VIC).
Common questions
FAQs about what can cause epilepsy
How is epilepsy caused? +
Epilepsy Action Australia lists head injury, stroke or brain haemorrhage, lack of oxygen, brain infections, brain tumours, brain abnormalities present at birth and genetic factors. In about half of people diagnosed the cause is never known. A specialist can explain what may apply to you.
Can epilepsy cause memory loss? +
Tell your GP or neurologist about any memory changes, because a doctor needs to assess what is behind them. Keep a note of when problems happen and what else has changed, then bring it to your appointment.
Can you develop epilepsy in your twenties? +
Epilepsy can develop in adults, and any new seizure is a reason to see a doctor. A GP can refer you to a neurologist, who can look for a cause and explain what the results mean for you.
How do you prevent epilepsy? +
There is no simple answer, because causes differ and in about half of people the cause is never known. Ask your GP what can reduce the risk of causes such as head injury or stroke, and follow your doctor’s advice about your own health.