The current classification of epileptic seizures, epilepsies, and epilepsy syndromes is considered first. The presence of progressive neurological signs is a cause for concern and suggests a degenerative disorder. Investigations may include biochemical investigation, EEG, video telemetry, cranial imaging, and DNA diagnostics. Affected males with fragile-X have an increased frequency of epilepsy. Estimates of its prevalence vary from 28% to 45%. Seizures may be generalized tonic-clonic, partial with or without secondary generalization, or of multiple types. Advances in human molecular genetic techniques have allowed positional cloning strategies to be applied to identification of the defective genes and their protein products. A number of studies have been performed on the incidence of epilepsy in the offspring of epileptic parents, and provide an empiric risk of 1. 7%-7. 3%, with a median of 4. 2% for all types of seizures, including febrile convulsions and single seizures.