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Magnetic resonance imaging (MRI) and epilepsy

What is an MRI scan used for?

Some people have epilepsy because they have some damage in their brain. This may have been caused by scar tissue from an illness or a brain injury. An MRI scan is used to find out if you have any type of damage to your brain.

How does an MRI scan show the damage?

The MRI scan uses a strong magnetic field and radio waves to create pictures on a computer of tissues, organs and other structures inside your body. These pictures can show up any damage in your brain. 

What does it involve?

The MRI scanner is like a tunnel. It is about 1.5 metres (5 feet) long and is surrounded by a large circular magnet. You lie on a bed, which then slides into the open-ended scanner. During the scan, the MRI will send images of your brain to a computer, which will show different types of brain tissue in different colours.

The MRI scan itself doesn't hurt. The radiographer who does the scan might need to inject you in your hand or arm, with a harmless dye. This is to make the tissue show up as clearly as possible. A few people have had allergies to the dye, so the radiographer will ask if you have any allergies first.

You need to keep still while you are being scanned, otherwise the scan picture may be blurred.

The MRI scan can last between 15 and 90 minutes.

How will I feel during my MRI scan?

The MRI is noisy when it is scanning but you will be given earplugs or headphones to protect your hearing. The inside of the scanner is like a hollow open-ended tube. You might find this worrying if you are uncomfortable in confined spaces. You may be given a buzzer to hold, so that you can let the radiographer know if you feel uncomfortable while the scan is being done.

You might be able to listen to music, or watch a DVD while the scan is done, to help you to relax. A relative or friend might be able to go into the room with you.

If you feel nervous, or can’t keep still while the scan is being done, you could be offered medicine to help you relax or sleep. Young children and people with learning disabilities may need a very light general anaesthetic to make sure that they keep completely still during the scan. This is to avoid the scan pictures being blurred.

What will happen after my MRI scan?

After your scan, a radiologist will read the pictures taken by the MRI. They will then send your results to the doctor who arranged your scan. This will usually be your epilepsy specialist.

Will I be offered an MRI scan?

You might be offered an MRI scan when you are first being investigated for epilepsy, or if your seizures are difficult to control. The National Institute for Care and Health Excellence (NICE) recommends that you should have an MRI scan if you are in one of the following groups:

  • You developed epilepsy before you were 2 years old
  • You developed epilepsy when you were a child or an adult and there’s a chance it is caused by some damage to your brain
  • You are still having seizures even though you are taking epilepsy medicines

Is an MRI scan safe?

If you are being considered for an MRI scan, your doctor will ask whether you have a pacemaker, vagal nerve stimulator, or any other metal parts in your body. This is because the MRI scanner uses an extremely strong magnet, which can move, or damage metal objects, or affect the way they work.

Metal objects can also affect the quality of the pictures from the scan. So, if you have metal in your body, an MRI scan is not suitable for you. However, if you can’t have an MRI scan, your epilepsy specialist, nurse or doctor may be able to arrange for you to have a different type of scan.

Is an MRI scan useful for everyone?

An MRI is not always useful for people who have generalised seizures (when seizures affect both halves of their brain) or benign rolandic epilepsy. This is because these types of epilepsy aren’t likely to be caused by damage to a single part of the brain. So, an MRI scan isn’t likely to find anything that could help with your diagnosis.

How can I get an MRI scan?

If you believe an MRI scan would help get the best treatment for your epilepsy, ask your GP, epilepsy nurse or specialist to arrange one for you. If they agree, NICE recommends an MRI scan should be done within 4 weeks of the doctor requesting it.

Further information

More information about MRI scans on nhs.uk

If you would like to see this information with references, visit the Advice and Information references section of our website. If you are unable to access the internet, please contact our Epilepsy Freephone Helpline on 0808 800 5050.


Epilepsy Action would like to thank Dr Amanda Freeman, Consultant Paediatrician at Queen Alexandra Hospital, Portsmouth, UK for her contribution to this information.
Dr Amanda Freeman has no conflict of interest to declare.

This information has been produced under the terms of The Information Standard.

  • Updated December 2016
    To be reviewed December 2019

Comments: read the 4 comments or add yours


I am the mother of a 25 year old who has just recently been diagnosed with epilepsy. His first MRI in March of 2016 was inconclusive. He has been in denial ever since and admits he needs help with more issues than just epilepsy, but will not seek help. In that he is an adult, I can't help him other than being here along the way to support him and learn more about epilepsy. It is killing me to basically see him destroy himself. I need help on learning how to deal with this as well. Any suggestions?

Submitted by Lisa Pearson on

Hi Lisa

It must be so tough to watch someone you care about not looking after themselves as well as you would wish. We regularly have conversations with parents of young people who are struggling to accept their diagnosis.

For a lot of people the wish to get seizure control is the thing that gives them the motivation to understand more about their condition. The wish to drive can be a big part of this. Getting good seizure control involves knowing about possible triggers, especially how important it is to take your epilepsy medicine completely regularly. Your son may possibly be interested in joining our online community forum4e. It’s for people with epilepsy and carers of people with epilepsy. Sometimes people in your son’s situation find the forum an easier place to start. Also if he is prepared to engage at all with the health services, there may be an epilepsy nurse at the clinic, that he would feel okay talking to.

Knowing as much as possible about epilepsy yourself is certainly one way forward. You may want to start with our information for people newly diagnosed.

Apart from that, the best thing you can do for your son is makes sure he knows where to get the information if and when he does want it. And to stay patient. If he is going to come to terms with his condition he will need to do it in his own way and time.

You mentioned your son has other issues too. I wonder if our information on epilepsy and wellbeing would help with that?

If the situation is affecting your own health, you may find it useful to talk this through with you family doctor.

I do hope things move forward in a positive way for you both soon.




Epilepsy Action Helpline Team

Submitted by todd at Epileps... on

From 18yrs to 29yrs I had approx 10-12 gran mall seizures. Today I am on Phenobarbital to control them. I just had an MRI done to my brain for I was having headaches &my head I could feel pressure. Shouldn't this MRI machine showed my seizures from the past?

Submitted by Jo Anne Via on

Hi Jo Anne

An MRI show changes to the structure  of your brain. So it would show if there is any damage to the brain that may be causing seizures. It does not show seizure activity in itself.

Here is a link to some more general information about MRIs

I hope this helps.



Epilepsy Action Helpline Team

Submitted by Cherry-Epilepsy... on