Secondary epilepsy is also hereditary The magnitude of the genetic influence is related to the cause of epilepsy. The prevalence of epilepsy in relatives with primary epilepsy is 3%-4%, whereas in secondary epilepsy it is 0%-1%, indicating that the genetic influence of primary epilepsy is high, and the closer the blood relationship, the higher the prevalence. In addition, the incidence of epilepsy increases to 20% in the third generation when both parents have epilepsy, or when a child has epilepsy. Therefore, primary epilepsy patients can marry, but should limit their fertility. When choosing a spouse, epileptic patients should be careful not to marry a subject with a history of epilepsy and febrile convulsions in the family or themselves, and should not marry a person with close blood ties. By primary epilepsy, we mean that the onset is under 25 years of age, the seizure form is grand mal or petit mal, there is no limited brain damage on brain map and neurological examination, and no clear cause has been found.