The incidence of epilepsy is now significantly higher than before, so what exactly is epilepsy? Below I will explain what is determined to be epilepsy. Epilepsy has two main features in a person’s response: 1. epileptiform discharges on the electroencephalogram and clinical seizures. 2. Medical history. Through the history we can get a lot of valuable information: (1) whether the seizures have the commonality of epileptic seizures; (2) whether the seizure manifestations have the characteristics of different seizure types, such as generalized tonic-clonic seizures characterized by loss of consciousness and generalized convulsions, if only generalized convulsions without loss of consciousness are considered pseudoseizures or hypocalcemic convulsions, which do not support the epilepsy If the loss of consciousness is accompanied by a fall, the possibility of considering syncope is greater than the possibility of an epileptic seizure; the features of automatism are accompanied by impaired consciousness and seemingly purposeful but actually purposeless abnormal behavior, and if the details of the seizure can be told after the seizure also do not support the diagnosis of epileptic automatism. When the patient has both of the bases we obtained through the history, an EEG is needed to find supporting evidence for the diagnosis and to rule out other non-epileptic seizure disorders.