Why it's doneBy Mayo Clinic staff
An EEG can determine changes in brain activity that may be useful in diagnosing brain disorders, especially epilepsy. An EEG may be helpful to confirm, rule out or provide information that helps with management of the following disorders:
- Epilepsy or other seizure disorder
- Brain tumor
- Head injury
- Brain dysfunction that may have a variety of causes (encephalopathy)
- Inflammation of the brain (encephalitis)
- Sleep disorders
- Memory impairment
An EEG can't measure intelligence or detect mental illness. It may be used to confirm brain death in someone in a persistent coma.
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