Fever seizures (febrile seizures) are uncontrolled muscle spasms and unresponsiveness in a child that are caused by a rapid increase in body temperature. They usually last 1 to 3 minutes and are seldom serious.
Fevers that lead to a fever seizure may develop so quickly that parents did not even realize that their child's temperature was rising. After a fever has reached a high temperature, the risk of a seizure is probably over.
Fever seizures are not a form of epilepsy. A seizure is likely to be fever-related if:
WebMD Medical Reference from Healthwise