Febrile convulsions are the most common type of convulsions in childhood, affecting 2 to 5% of all children between three months and five years of age. This problem rarely occurre in children over 5 years. Febrile convulsions have defined by the International League Against Epilepsy (ILAE) as a convulsions occurring in childhood after one month of age, associated with febrile illness not caused by an infection of the central nervous system, without previous neonatal and convulsions or a previous unprovoked convulsions and not meeting criteria for other active symptomatic convulsions. About one and a half million febrile convulsions events occur per year in the United States.