Because epilepsy is caused by abnormal activity in brain cells, seizures can affect any process your brain coordinates. A seizure can produce symptoms such as:
- Temporary confusion
- A staring spell
- Uncontrollable jerking movements of the arms and legs
- Loss of consciousness or awareness
- Psychic symptoms
Symptoms vary depending on the type of seizure. In most cases, a person with epilepsy will tend to have the same type of seizure each time, so the symptoms will be similar from episode to episode.
Doctors generally classify seizures as either focal or generalized, based on how the abnormal brain activity begins.
When seizures appear to result from abnormal activity in just one area of your brain, they're called focal (partial) seizures. These seizures fall into two categories.
- Simple focal seizures. These seizures don't result in loss of consciousness. They may alter emotions or change the way things look, smell, feel, taste or sound. They may also result in involuntary jerking of a body part, such as an arm or leg, and spontaneous sensory symptoms such as tingling, dizziness and flashing lights.
- Dyscognitive focal seizures. These seizures alter consciousness or awareness and may cause you to lose awareness for a period of time. Dyscognitive focal seizures often result in staring and purposeless movements — such as hand rubbing, chewing, swallowing or walking in circles.
Seizures that appear to involve all areas of the brain are called generalized seizures. Six types of generalized seizures exist.
- Absence seizures. Absence seizures, also called petit mal seizures, are characterized by staring and subtle body movement. These seizures can cause a brief loss of awareness.
- Tonic seizures. Tonic seizures cause stiffening of your muscles. These seizures usually affect muscles in your back, arms and legs and may cause you to fall to the ground.
- Clonic seizures. Clonic seizures are associated with rhythmic, jerking muscle movements. These seizures usually affect the neck, face and arms.
- Myoclonic seizures. Myoclonic seizures usually appear as sudden brief jerks or twitches of your arms and legs.
- Atonic seizures. Atonic seizures, also known as drop seizures, cause a loss of muscle control, which may cause you to suddenly collapse or fall down.
- Tonic-clonic seizures. Tonic-clonic seizures, also called grand mal seizures, are characterized by a loss of consciousness, body stiffening and shaking, and sometimes loss of bladder control or biting your tongue.
When to see a doctor
Seek immediate medical help if any of the following occurs:
- The seizure lasts more than five minutes.
- Breathing or consciousness doesn't return after the seizure stops.
- A second seizure follows immediately.
- You have a high fever.
- You're experiencing heat exhaustion.
- You're pregnant.
- You have diabetes.
- You've injured yourself during the seizure.
If you experience a seizure for the first time, seek medical advice.
May. 31, 2013
- Seizures and epilepsy: Hope through research. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/epilepsy/detail_epilepsy.htm. Accessed Jan. 18, 2013.
- Schachter SC. Evaluation of the first seizure in adults. http://www.uptodate.com/home. Accessed Jan. 18, 2013.
- Is an emergency room visit needed? Epilepsy Foundation. http://www.epilepsyfoundation.org/aboutepilepsy/firstaid/is-an-emergency-room-visit-needed.cfm. Accessed Jan. 28, 2013.
- Injuries from seizures. Epilepsy Foundation. http://www.epilepsyfoundation.org/aboutepilepsy/healthrisks/injuriesfromseizures.cfm. Accessed Jan. 28, 2013.
- Fact sheet on seizure-related causes of death and preventative measures. Epilepsy Foundation. http://www.epilepsyfoundation.org/resources/newsroom/pressreleases/Fact-Sheet-on-Seizure-Related-Causes-of-Death-and-Preventative-Measures.cfm. Accessed Jan. 28, 2013.
- Schachter SC. Sudden unexpected death in epilepsy. http://www.uptodate.com/home. Accessed Jan. 18, 2013.
- Frequently asked questions. Epilepsy Foundation. http://www.epilepsyfoundation.org/aboutepilepsy/faq.cfm. Accessed Jan. 28, 2013.
- Neurological diagnostic tests and procedures. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/misc/diagnostic_tests.htm. Accessed Jan. 28, 2013.
- Hirsch LJ, et al. Neuroimaging in the evaluation of seizures and epilepsy. http://www.uptodate.com/home. Accessed Jan. 18, 2013.
- Karceski S. Initial treatment of epilepsy in adults. http://www.uptodate.com/home. Accessed Jan. 18, 2013.
- Schachter SC. Overview of the management of epilepsy in adults. http://www.uptodate.com/home. Accessed Jan. 18, 2013.
- Wetjen NM, et al. Subtraction ictal single-photon emission computed tomography coregistered to magnetic resonance imaging in evaluating the need for repeated epilepsy surgery. Journal of Neurosurgery. 2006;105:71.
- Noe KH. Seizures: Diagnosis and management in the outpatient setting. Seminars in Neurology. 2011;31:54.
- Barbara Woodward Lips Patient Education Center. Surgical treatment for seizures. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2004.
- O'Brien TJ, et al. Subtraction SPECT co-registered to MRI improves postictal SPECT localization of seizure foci. Neurology. 1999;52:137.
- Lyons MK. Deep brain stimulation: Current and future clinical applications. Mayo Clinic Proceedings. 2011;86:662.
- U.S. News best hospitals 2012-2013. U.S. News & World Report. http://health.usnews.com/best-hospitals/rankings. Accessed Jan. 25, 2013.
- First responders. Epilepsy Foundation. http://www.epilepsyfoundation.org/livingwithepilepsy/firstresponders/. Accessed Jan. 31, 2013.
- Staying healthy. Epilepsy Foundation. http://www.epilepsyfoundation.org/livingwithepilepsy/healthandwellness/stayinghealthy/index.cfm. Accessed Jan. 31, 2013.
- Transportation. Epilepsy Foundation. http://www.epilepsyfoundation.org/livingwithepilepsy/parentsandcaregivers/caregivers/transportation.cfm. Accessed Jan. 31, 2013.
- First aid. Epilepsy Foundation. http://www.epilepsyfoundation.org/aboutepilepsy/firstaid/index.cfm. Accessed Jan. 31, 2013.
- Finding employment. Epilepsy Foundation. http://www.epilepsyfoundation.org/livingwithepilepsy/employmenttopics/findingemployment.cfm. Accessed Feb. 4, 2013.
- Romanelli P, et al. Non-resective surgery and radiosurgery for treatment of drug-resistant epilepsy. Epilepsy Research. 2012;99:193.
- Worrell GA (expert opinion). Mayo Clinic, Rochester, Minn. April 29, 2013.
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