Tonic-Clonic seizure: Abnormal electrical activity in the brain which results in stiffening and rigidity of muscles (tonic phase) followed by rhythmic jerking motions (clonic phase). The tonic phase tends to last less than half a minute and the clonic phase usually lasts a couple of minutes. This type of seizure affects the whole brain. Full recovery from symptoms such as fatigue following an episode may take from minutes to days. Consciousness tends to return slowly. More detailed information about the symptoms, causes, and treatments of Tonic-Clonic seizure is available below.
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