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Medically reviewed by Last updated on Jul 7, 2024.

What do I need to know about an electroencephalogram (EEG)?

An EEG is a test that measures the electrical activity in your brain. It can help healthcare providers decide what treatments you need. An EEG can also help diagnose or monitor any of the following:

How do I prepare for an EEG?

Your healthcare provider will talk to you about how to prepare for an EEG. The provider will tell you which medicines to take or not take on the day of your test. Do not drink or eat foods with caffeine on the day of your test. Do not put oils or lotions on your scalp or hair for 24 hours before your test. This includes conditioner, hair spray, hair cream, or hair gel. Your provider may tell you to sleep less than usual the night before your test.

What will happen during an EEG?

Care Agreement

You have the right to help plan your care. Learn about your health condition and how it may be treated. Discuss treatment options with your healthcare providers to decide what care you want to receive. You always have the right to refuse treatment. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.