Electroencephalogram (EEG)
Are there any risks or side effects?
The EEG procedure is painless, comfortable and generally very safe. No electricity is put into your body while it's carried out. Apart from having messy hair and possibly feeling a bit tired, you won't normally experience any after effects.
However, you may feel lightheaded and notice a tingling in your lips and fingers for a few minutes during the hyperventilation part of the test. Some people develop a mild rash where the electrodes were attached.
There's a very small risk you couldhave a seizure while the test is carried out, but you'll be closely monitored and help will be on hand in casethis happens.
Medically Reviewed by a doctor on 21 Dec 2018
Introduction
Read about why an electroencephalogram (EEG) recording may be needed and find out what happens before, during and after the test.
When an EEG is used
An EEG can be used to help diagnose and monitor a number of conditions affecting the brain.It may helpidentify the cause of certain symptoms such as seizures (fits) or memory problems or find out more
Preparing for an EEG
Your appointment letter will mention anything you need to do to prepare for the test.Unlesstold otherwise, you can usually eat and drink beforehand and continue to take all your normal medication.To h
How an EEG is carried out
There are several different ways an EEG recording can be taken. The clinical neurophysiologist will explain the procedure to you andcan answerany questions you have.You'll also be asked whether you gi
Types of EEG
The main types of EEG are explained below.Routine EEGA routine EEG recording lasts for about 20 to 40 minutes.During the test, you'll be asked to rest quietly and open or close your eyesfrom time to t
What happens after an EEG
When the test is finished,the electrodes will be removed and your scalp will be cleaned. Your hair will probably still be a bit sticky and messy afterwards, so you may want to wash it when you get hom
Are there any risks or side effects?
The EEG procedure is painless, comfortable and generally very safe. No electricity is put into your body while it's carried out. Apart from having messy hair and possibly feeling a bit tired, you won'
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