The lack of a subjacent brain lesion and a neurological or intellectual disability describe idiopathic partial epileptic disorders. In the majority of instances, there is a clear genetic tendency. A family history of benign epilepsy is common. The age at onset is usually before 20 years of age and the frequency of seizures decreases with age. Genetic factors play an important role in the development of this type of epilepsy. Mutations in more than 30 genes have been identified as causes of idiopathic partial epilepsies.