Patients with febrile convulsions (convulsive seizures due to high fever) should have an electroencephalogram (EEG) done as soon as possible if possible, and it is best if the EEG changes can be monitored at the onset of the febrile convulsions. The main purpose of EEG in patients with febrile convulsions is to identify the cause of the convulsions. By examining the dynamics of the EEG several times, it is possible to observe whether the symptoms appear as a result of epileptic discharges or changes due to other factors (e.g., infection, etc.). Feverish convulsions may present with discharges early on, but as the infectious disease is controlled, the EEG will gradually normalize and can help further determine the cause. As the symptoms of febrile convulsions resolve, the abnormal EEG manifestations may fade away, and if the EEG is done too late, it may not be helpful in making a diagnosis. However, many patients with febrile convulsions are not in the hospital at the time of the onset of symptoms and are unable to have an EEG done when symptoms are most typical. In this case too, an EEG should be done as early as possible to have a better chance of detecting an abnormal EEG.