A seizure is an episode of disturbed brain activity that can affect a variety of mental and physical functions. There are two major forms of seizures.
Also see epilepsy.
Generalized seizures seem to begin everywhere in the brain at once. They include:
- Absence seizures (also known as petit mal seizures) – staring with brief loss of consciousness; fluttering eyelids
- Myoclonic seizures – sporadic or repeated brief jerks of the limbs
- Clonic seizures – repetitive, rhythmic jerking movements of head or limbs
- Tonic seizures – loss of consciousness, stiffness and rigidity of the whole body; risk of falling
- Tonic-clonic seizures (also known as grand mal seizures) – loss of consciousness, rigid muscles, whole-body convulsions; risk of falling
- Atonic seizures (drop attacks) – loss of muscle tone in head or body; high risk of falling
Partial seizures are also called focal or local seizures. They begin in one location of the brain.