Letter T

Tonic-clonic seizure

The classic type of epileptic seizure consisting of two phases to a tonic-clonic seizure -- the tonic phase and the clonic phase.

In the tonic phase the body becomes entire rigid, and in the clonic phase there is uncontrolled jerking.

Tonic-clonic seizures may or may not be preceded by an aura, and are often followed by headache, confusion, and sleep.

They may last mere seconds, or continue for several minutes.

Also known as a grand mal seizure.

If a tonic-clonic seizure does not resolve or if such seizures follow each other in rapid succession, seek emergency help.

The person could be in a life-threatening state known as status epilepticus.

Medical disclaimer

The information on this page is for educational and informational purposes only and does not constitute medical advice in any way.

It does not replace the advice of a physician, pharmacist or other healthcare professional.
It does not represent a prescription of drugs, diagnostic exams or therapies.
In case of symptoms, doubts or concerns about your health, always consult a qualified physician.

In case of emergency call 911 (US) or 112 (EU).