Although they can be frightening to parents, the vast majority of febrile seizures are short and harmless. During a seizure, there is a small chance that the child may be injured by falling or may choke from food or saliva in the mouth. Using proper first aid for seizures can help avoid these hazards (see section entitled "What should be done for a child having a febrile seizure?").
There is no evidence that short febrile seizures cause brain damage. Large studies have found that children with febrile seizures have normal school achievement and perform as well on intellectual tests as their siblings who don't have seizures. Even when seizures are very long (more than 1 hour), most children recover completely, but a few might be at risk of subsequent seizures without fever (epilepsy).
In other words, between 95 and 98 percent of children who experience febrile seizures do not go on to develop epilepsy. However, although the absolute risk remains small, some groups of children--including those with cerebral palsy, delated development, or other neurological abnormalities--have an increased risk of developing epilepsy. The type of febrile seizure also matters:; children who have prolonged febrile seizures (particularly lasting more than an hour) or seizures that affect only part of the body, or that recur within 24 hours, are at a somewhat higher risk. Among children who don't have any of these risk factors, only one in 100 develops epilepsy after a febrile seizure.