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They also can occur as “generalized onset” seizures in which seizure activity starts simultaneously over both sides of the brain.

Generalized seizures can start as focal seizures that spread to both sides of the brain.Focal onset seizures start in one area and can spread across the brain and cause mild or severe symptoms, depending on how the electrical discharges spread.There are two major classes or groups of seizures: focal onset and generalized onset.Seizures symptoms vary and can include a sudden change in awareness or full loss of consciousness, unusual sensations or thoughts, involuntary twitching or stiffness in the body or severe stiffening and limb shaking with loss of consciousness (a convulsion.).