Epilepsy is a brain disorder involving repeated, spontaneous seizures of any type. Seizures ("fits," convulsions) are episodes of disturbed brain function that cause changes in attention or behavior. They are caused by abnormally excited electrical signals in the brain. Seizures happen when your brain cells, which communicate through electrical signals, send out abnormal signals. Having several seizures (recurrent seizures) is considered epilepsy. Seizures are not considered to be epilepsy if they occur only once or are correctable. Epilepsy can happen at any age, but it is most common in the elderly. Many children with epilepsy outgrow the condition. However, even mild seizures that happen more than once should be treated, because they could cause harm if they happen while you are driving, walking, or swimming, for example.