Epilepsy is a chronic brain disorder caused by multiple etiologies, and its onset is essentially due to excessive abnormal neuronal discharge in the brain. So why do some patients exhibit generalized convulsions, purple lips and tongue bites that feel ‘very frightening’ while others are only slightly ‘dazed’? If a patient presents with generalized convulsions, he or she is quickly admitted to the hospital and diagnosed, while those who present with less typical symptoms may remain undiagnosed for a long time, and some may even be misdiagnosed with other diseases. It turns out that epilepsy is not simply called “sheep epilepsy”, but is divided into “generalized seizures” and “focal seizures” according to the clinical manifestations of the seizures and the results of the EEG. A generalized seizure is one in which both hemispheres of the brain are involved at the same time during the seizure discharge, and the patient may have tonic-clonic, myoclonic, tonic and akinetic seizures. Focal seizures are epileptic discharges that originate from a group of neurons in one hemisphere, and may manifest clinically as localized convulsions, sensory abnormalities, and autonomic symptoms. Of course, sometimes focal seizure discharges can also spread to the contralateral hemisphere, which can cause secondary generalized seizures.