An atonic seizure is a sudden loss of muscle tone in the muscles that hold the body and head upright.
The seizure occurs without warning and usually causes the person to fall down.
Some atonic seizures may be more limited, only causing the person's head to drop for a moment.
Atonic seizures are fairly uncommon and occur mostly in people with Lennox-Gastaut syndrome. This is a severe form of generalized epilepsy that begins in early childhood. (Children with Lennox-Gastaut syndrome may also have tonic seizures.)
Watching your child have his or her first seizure was probably one of the most frightening moments of your life. Finding out that your child has epilepsy may have been another one. The future may suddenly seem terrifying and uncertain for both your child and your whole family. But as you may already know, the news is not nearly as bad as it sounds. Here are some things to keep in mind if your child has had a seizure:
Most children who have a seizure don't have another one.