In medical books and clinical diagnosis often see the term “primary” disease, such as primary hypertension, primary is also called idiopathic, the meaning of the word primary is a bit vague, refers to a disease can not find the cause rather than no cause, under the sky everything is a huge statistical table and cause and effect, there is no water without a source, let alone disease without a cause, a cough, sneeze a have a cause, let alone sick, just The cause of the disease is just not found by the limited means of examination. The cause of primary epilepsy is unknown, there are no obvious pathological or metabolic changes in the brain, and various changes in the internal and external environment within the physiological range can induce its onset. Primary epilepsy tends to develop around age 5 or during adolescence. In Western medical terminology, the term “primary” is often used for diseases for which no cause can be found, such as primary hypertension. Epilepsy is no exception, and epilepsy that has no known cause is called “primary epilepsy”, also known as “idiopathic epilepsy”. However, this is not static. With the development of science and technology, what was not understood in the past is now understood, and patients who were diagnosed with “primary epilepsy” in the past have now found the cause and are classified as having secondary epilepsy. For example, before the invention of CT and MRI, many patients with epilepsy could not find the cause and could only be diagnosed as “primary epilepsy”, but after CT and MRI were used in clinical practice, it was found that these so-called “primary epilepsy” were caused by some small benign tumors, cerebral infarction, congenital malformation or traumatic epilepsy, so these patients could no longer be classified as “primary epilepsy”, but as “secondary epilepsy”. The patients with epilepsy are no longer classified as “primary epilepsy” but as “secondary epilepsy. Therefore, we can predict that the scope of “primary epilepsy” will become narrower and narrower as the causes of epilepsy are better understood. Does it mean that “primary epilepsy” is a general term for epilepsy of unknown origin and has no pattern of its own? Of course not, it has its own characteristics. For example, the genetic predisposition is obvious, most of the seizures start in adolescents, most of the seizure types are tonic clonic seizures (grand mal) and disoriented seizures (petit mal), and they are easier to control with antiepileptic drugs.