The most necessary and critical test for epilepsy is the EEG. Besides the EEG, there are very, very many related tests that need to be done, because there is not one nor two causes of epilepsy, there could be many, and there could be causes that are not found in the current cognitive field. So epilepsy turns out to include primary epilepsy and secondary epilepsy. No cause can be found for primary epilepsy, but from experience, all epilepsy should have a cause. The reason is that epilepsy is caused by abnormal neuronal discharge in the brain, and it may be caused by any lesion in the skull, such as cerebral infarction, encephalitis or congenital abnormal development of the skull, which can lead to epilepsy. Usually, the mandatory test at the hospital is an EEG to detect epileptic waves and observe whether there are persistent abnormal epileptic discharges. In addition it will be done in conjunction with the patient’s condition, such as age, gender, and previous conditions.