By Gerald C. McIntosh, MD Febrile seizures are convulsions that can occur in children with fever .
Fever lowers the seizure threshold in the brain.
This kind of seizure usually happens when there is a rapid rise in temperature. The average temperature at which these seizures occur is 104 degrees Fahrenheit. Some seizures may occur at a higher or lower temperature. During a seizure, the child becomes unconscious. The eyes roll upward.