Febrile seizure is a seizure associated with a high body temperature but without any serious underlying health issue.
They most commonly occur in children between the ages of 6 months and 5 years.
Seizures occur because the brain becomes irritated and an "electrical storm" occurs. This "electrical storm" occurs because the normal connections between the cells in the brain do not function properly. This causes the brain to try to shut down because of the electrical surge. The muscle shaking occurs because the brain is ending out signals to every muscle group, asking them to contract. Most seizures are self-limiting and are followed by a so-called postictal period, in which the brain can be considered to "reboot and restart" all its programs, similar to a computer when it is rebooted.