If a person with epilepsy has had an EEG once and the doctor asks him to have another one, he will show doubt: “Is it necessary?” In fact, it is necessary for epileptic patients to review EEG frequently. Seizures are abnormal discharges of neurons in the brain, and these abnormal discharges appear on the EEG as abnormal waves such as “spikes, spines, multi-spines, spikes and slow complex waves”. These waves can appear during seizures or when they are not.