Can my child have epilepsy with a normal EEG?
Yash Shah, MD, MPH
Pediatric neurologist and epileptologist
Last reviewed
Reading time
5 minutes
The short answer
Yes.
An EEG records brain activity for a short window, often 20 to 60 minutes. A child can have epilepsy and still have a normal EEG on a given day, because the brain's abnormal electrical signals come and go.
About 6 in 10 children who turned out to have epilepsy had epilepsy-type changes on their EEG. So about 4 in 10 did not.
About 1 in 20 children who did not have epilepsy had these changes too.
What to do next
Keep a video of the episodes. Start recording when it is safe. Try to show your child's whole body and face.
Write down when they happen and how long they last. Note what your child was doing just before, like sleeping or waking up.
Ask whether a sleep-deprived or longer EEG would help. Bring your videos and notes to the visit.
Why the EEG can be normal
Think of a routine EEG as a short video of the brain's electrical activity. In many children with epilepsy, the unusual signals show up only now and then. If they don't happen during the recording, the EEG looks normal.
That is why a normal EEG does not rule out epilepsy. And an abnormal EEG does not prove it on its own.
What helps an EEG find changes
- Sleep. Many epilepsy-type changes show up more during sleep. A sleep-deprived EEG helps your child fall asleep during the test.
- More time. A longer EEG, for a few hours, overnight, or over several days, gives the signals more chances to appear.
- Catching an episode. If your child has an episode during the EEG, the doctor can see what the brain is doing at that moment. Video helps.
Can a child without epilepsy have an abnormal EEG?
Yes, but it is uncommon. In the same study, about 1 in 20 children who did not have epilepsy had epilepsy-type changes on their EEG. This is one reason doctors do not diagnose epilepsy from the EEG alone.
How your child's doctor decides
Epilepsy is diagnosed from the whole picture: what the episodes look like, how often they happen, your videos, the exam and the EEG. Your description and your videos are often the most useful pieces.
When to call the doctor or 911
Call 911 now if
- A seizure lasts 5 minutes or longer.
- One seizure follows another and your child does not wake up in between.
- Your child has trouble breathing, or their lips turn blue or gray.
- The seizure happens in water, or your child is badly hurt.
Call your child's doctor if
- This was your child's first seizure, once your child is safe.
- The episodes look different or happen more often.
- Your child is not back to normal after a few hours.
- You have questions about medicine or side effects.
References
- Slinger G, Noorlag L, van Diessen E, Otte WM, Zijlmans M, Jansen FE, Braun KPJ. Clinical characteristics and diagnoses of 1213 children referred to a first seizure clinic. Epilepsia Open. 2024;9(2):548-557. PubMed 38101810doi:10.1002/epi4.12883