Seizures
Educational information. Individual clinical review of this presentation by Dr. Ehsan is not yet documented. It does not replace personal medical evaluation.
Source: MedlinePlus, National Library of Medicine. Read the original source
MedlinePlus data edition September 26, 2026. Imported September 27, 2026. These dates do not indicate a new clinical review of the article.
Seizures are symptoms of a brain problem. They happen because of sudden, abnormal electrical activity in the brain. When people think of seizures, they often think of convulsions in which a person's body shakes rapidly and uncontrollably. Not all seizures cause convulsions. There are many types of seizures and some have mild symptoms. Seizures fall into two main groups. Focal seizures, also called partial seizures, happen in just one part of the brain. Generalized seizures are a result of abnormal activity on both sides of the brain.
Most seizures last from 30 seconds to 2 minutes and do not cause lasting harm. However, it is a medical emergency if seizures last longer than 5 minutes or if a person has many seizures and does not wake up between them. Seizures can have many causes, including medicines, high fevers, head injuries and certain diseases. People who have recurring seizures due to a brain disorder have epilepsy.
NIH: National Institute of Neurological Disorders and Stroke
Symptoms, tests and care options
Further reading selected by MedlinePlus. Links open the original organizations’ websites.
- Convulsions - first aid - series · Medical Encyclopedia
- EEG (Electroencephalogram) · Mayo Foundation for Medical Education and Research
- First Aid for Seizures · Centers for Disease Control and Prevention
- Head CT (Computed Tomography, CAT Scan) · Radiological Society of North America
- Vagus Nerve Stimulation · Mayo Foundation for Medical Education and Research
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