Epilepsy is a chronic condition produced by temporary changes in the electrical function of the brain, causing seizures, which can affect awareness, movement, or sensation.
Seizures occur when clusters of nerve cells in the brain, called neurons, signal or communicate with each other abnormally. During a seizure, the neurons' normal pattern of activity is disturbed. It causes them to fire as many as 500 times per second instead of the normal rate of about 80 times per second. This can cause strange sensations, emotions, and behavior, or convulsions, muscle spasms, and/or loss of consciousness.
Neurons in Nerve Tissue
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A diagnosis of epilepsy is usually not made until a person has a seizure more than once without a preventable cause.
The causes of abnormal brain wiring and imbalance of neurotransmitters are numerous. They can include:
In many cases, the exact cause of epilepsy is not known.
What are the risk factors for epilepsy?
What are the symptoms of epilepsy?
How is epilepsy diagnosed?
What are the treatments for epilepsy?
Are there screening tests for epilepsy?
How can I reduce my risk of epilepsy?
What questions should I ask my doctor?
What is it like to live with epilepsy?
Where can I get more information about epilepsy?
Epilepsy in adults. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T115086/Epilepsy-in-adults. Updated June 3, 2016. Accessed October 4, 2016.
Epilepsy in children. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T900174/Epilepsy-in-children. Updated May 5, 2016. Accessed October 4, 2016.
Lowenstein DH. Seizures and epilepsy. In: Longo DL, Fauci AS, et al, eds. Harrison's Principles of Internal Medicine. 18th ed. New York, NY: McGraw-Hill; 2012.
NINDS epilepsy information page. National Institute of Neurological Disorders and Stroke website. Available at: http://www.ninds.nih.gov/disorders/epilepsy/epilepsy.htm. Updated February 21, 2013. Accessed February 22, 2013.
Seizure disorders. Merck Manual Professional Version website. Available at: http://www.merckmanuals.com/professional/neurologic-disorders/seizure-disorders/seizure-disorders. Updated May 2012. Accessed February 22, 2013.
What is epilepsy? Epilepsy Foundation website. Available at: http://www.epilepsy.com/learn/epilepsy-101/what-epilepsy. Accessed February 22, 2013.
Last reviewed March 2016 by Rimas Lukas, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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