Seizure - petit mal; Seizure - absence; Petit mal seizure; Epilepsy - absence seizure
An absence seizure is the term for a type of seizure involving staring spells. This type of seizure is a brief (usually less than 15 seconds) disturbance of brain function due to abnormal electrical activity in the brain.
Seizures result from overactivity in the brain. Absence seizures occur most often in people under age 20, usually in children ages 4 to 12.
In some cases, the seizures are triggered by flashing lights or when the person breathes faster and more deeply than usual (hyperventilates).
Most absence seizures last only a few seconds. They often involve staring episodes. The episodes may:
Unexplained difficulties in school and learning difficulties may be the first sign of absence seizures.
During the seizure, the person may:
The person usually does not fall during the seizure.
Right after the seizure, the person is usually:
Specific symptoms of typical absence seizures may include:
Some absence seizures begin slower and last longer. These are called atypical absence seizures. Symptoms are similar to regular absence seizures, but muscle activity changes may be more noticeable.
The doctor will perform a physical exam. This will include a detailed look at the brain and nervous system.
An EEG (electroencephalogram) will be done to check the electrical activity in the brain. People with seizures often have abnormal electrical activity seen on this test. In some cases, the test shows the area in the brain where the seizures start. The brain may appear normal after a seizure or between seizures.
Blood tests may also be ordered to check for other health problems that may be causing the seizures.
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Review Date: 2/4/2020
Reviewed By: Amit M. Shelat, DO, FACP, FAAN, Attending Neurologist and Assistant Professor of Clinical Neurology, Stony Brook University School of Medicine, Stony Brook, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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