What are the stages of a tonic clonic seizure?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A tonic-clonic seizure occurs in three distinct stages: the tonic phase, marked by sudden muscle stiffening and loss of consciousness; the clonic phase, characterized by rhythmic jerking of the arms and legs; and the postictal phase, a recovery period involving confusion, fatigue, or headache. Recognizing these stages can help you respond appropriately and seek timely medical care.

If you or a loved one has experienced symptoms like these, understanding the cause is the critical next step. Seizures can stem from many underlying conditions, and identifying possible triggers early can guide better treatment decisions. Take a free, instant, online symptom check to gain personalized insights and confidently navigate what to do next.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if tonic-clonic seizures need care today Discover likely causes of tonic-clonic seizure stages See whether seizure symptoms suggest urgent care Find OTC options for seizure-related symptoms Find a doctor for seizure evaluation Discover medically valid home remedies for seizures Understand if your seizure symptoms need checking

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Explanation

Tonic clonic seizures, also known as grand mal seizures, usually follow these stages:

Tonic phase: The person's muscles suddenly stiffen, causing them to lose consciousness and often fall. This phase lasts about 10-20 seconds. Clonic phase: The muscles then begin to jerk rhythmically and rapidly. This phase may last from a few seconds to a few minutes. Postictal phase: After the seizure, the person enters a recovery period where they may feel tired, confused, or sleepy. This phase can last minutes to hours.

During the seizure, it's important to keep the person safe and avoid restraining them. If you're experiencing concerning symptoms and want to better understand what might be causing them, try our free symptom checker or seek medical help immediately if the seizure lasts more than 5 minutes or if complications occur.

(References)

Theodore WH, Porter RJ, Albert P, Kelley K, Bromfield E, Devinsky O, & Sato S. (1994). The secondarily generalized tonic-clonic seizure. Neurology, 8058138.
Bell WL, Walczak TS, Shin C, & Radtke RA. (1997). Painful generalised clonic and tonic-clonic seizures with .... Journal of neurology, neurosurgery, and psychiatry, 9416819.
Niaz FE, Abou-Khalil B, & Fakhoury T. (1999). The generalized tonic-clonic seizure in partial versus .... Epilepsia, 10565598.

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