What it Looks Like: Seizure

See also what Agonal RespirationsJugular Venous Distention, and Cardiac Arrest and CPR look like

A seizure is an episode of chaotic, disorderly electrical activity involving part or all of the brain. It is most often seen in epilepsy, but seizure can also occur acutely due to hypoglycemia, eclampsia, stroke, head trauma, alcohol withdrawal, and other causes.

Seizures are typically divided into two major types, partial seizures which involve only a portion of the brain, and generalized seizures which involve the entire brain.

Partial seizures are further divided into simple partial and complex partial seizures. In a simple partial seizure, consciousness is maintained, but unusual sensory, motor, or emotional sensations are observed — muscular tics, visual disturbances, strange feelings, and more are all possible depending on the area of the brain affected. Most often, this will then proceed into a larger seizure, in which case these early effects are called an aura, and used as a warning sign. Complex partial seizures are similar, but involve both hemispheres of the brain, and are distinguished by a loss of awareness or memory — the individual’s consciousness is impaired during the episode. This is the most common form of seizure.

The best known generalized seizures are tonic-clonic seizures, known historically (and still called by many laymen) “grand mal” seizures. They are characterized by two phases: a tonic phase, where the body becomes rigid and immobile, followed by a clonic phase, where full-body involuntary muscular jerking occurs. This is usually followed by a post-ictal period, where the patient may be unresponsive, or behave unusually, appearing combative, stuporous, or otherwise impaired. Either the tonic or clonic phase may be minimal or absent.

Absence seizures, historically “petit mal,” are characterized by a loss of awareness with a lack of outward activity. The individual may simply stare without moving or speaking, and after cessation of the seizure resume where he left off with no memory of the episode. Absence seizures may also present with some outward seizure activity, in which case the distinction between types becomes blurred.

Febrile seizures are seizures caused by elevated temperature (usually >100 degrees), most often seen in infants and young children. They are typically tonic-clonic in nature and almost always have benign outcomes; they rarely go on to develop into adult epilepsy.

Status epilepticus describes a prolonged seizure state, customarily defined as a seizure lasting over 30 minutes or multiple seizures without a full recovery in between. Some authorities draw the line at any seizure over 10 minutes, and there is evidence that even seizures longer than 5 minutes are unlikely to end without medical intervention. Status epilepticus is a true life-threatening emergency with high mortality; the continued chaotic activity of the brain can lead to permanent brain damage or death. Definitive treatment is the use of anti-convulsants, which attenuate the neuronal activity; in the field these are typically benzodiazepines like lorazepam (Ativan), diazepam (Valium), or midazolam (Versed). Since the duration from 911 call to EMS arrival on scene is often greater than 5-10 minutes, a seizure that is still ongoing upon your arrival should raise immediate suspicion of status epilepticus; a careful history should be obtained from bystanders when possible, including time since onset and any intervening recovery.

In some cases, seizures will be followed by a persistent, unilateral focal weakness in muscles that were active during the seizure. This is called Todd’s paresis, and since it can closely mimic the signs of stroke (even impairing eyesight or speech), it is wise to ask about recent seizure activity in patients with a history of a seizure disorder who present with signs of stroke.

Field care for seizure generally involves preventing secondary injury, such as blunt trauma caused by hitting or landing on nearby objects. During the tonic phase, respirations may be minimal, resulting in cyanosis; this is usually brief enough not to cause harm. The greatest concern is to maintain an open airway and prevent aspiration; when possible the patient should be placed in the lateral recovery position to help prevent soft tissue obstruction and allow fluids to drain away. Suction may be valuable, and an NPA may be considered in prolonged episodes. Supplemental oxygen is always appropriate, although a non-rebreather mask may not be tolerated in the post-ictal period. If respiration appears inadequate in prolonged seizures, positive pressure ventilation (by BVM or invasive airway) may be attempted.

This video from Dr. Robert S. Fisher is an excellent summary of the basic types of seizure. (Here is another on partial seizures; these are unusually good educational videos for a free resource.)

Here is an example of a simple partial seizure in a child, in this case manifesting as a repetitive facial tic. Note that the child retains consciousness throughout.

Here is an example of a complex partial seizure, also in a child. Note the repetitive, aimless movements of the arm and head, which are known as automatisms and are wholly involuntary; if spoken to, she would not respond.

Another complex partial seizure, in a young adult. Note the automatisms of the mouth and the wandering posturing of the arm.

An absence seizure in a child. Note the lack of any outward signs, except a total lack of responsiveness.

An excellent video of a tonic-clonic seizure in an adult. Note the labored breathing and obvious altered level of consciousness post-ictally.

Another good tonic-clonic in an adult. You see his awareness of its onset due to an aura, followed by gradual tonicity and then clonic jerks. Also note the snoring respirations; better positioning (and the suction catheter that the nurse couldn’t find) would have helped here.

Tonic-clonic in an infant, this one of febrile etiology.

Tonic-clonic in a sleeping adult; skip to 1:00 if you see better with lights.


  1. Can someone have a seizure and walk (impaired) and talk (impaired) and then have a total memory loss of the whole scenario? This particular part of the episode lasted about 10 minutes. Then the person was able to speak correctly but had a major headache, and nausea. That lasted about another 20 min. This person remembers nothing for about a half hour or 45 minutes. It resembled a stroke except it affected both sides of the body. She retained a headache the rest of the night and the next day had severe jaw muscle and leg muscle and arm muscle pain.

    • Jen, in many ways that sounds like a seizure — but beyond that I can’t comment with any intelligence or validity on individual cases without a lot more hands-on information and (frankly) much more training than I bring to the table.

    • Hi Jen, That sounds a lot like a complex partial seizure, where a person can walk around, but they may be mumbling or doing something repetitive, (eg fiddling with a button/zipper/hair), yet not be able to interpret what is going on, or communicate. So while they are partially conscious, the brain is having a seizure. There is often no recall of the event other than , as you say… confusion, sore, tired etc. These are difficult seizures to fully diagnose as they are normally triggered in one part of the brain, so people will act differently than the more ‘recognised’ tonic-clonic seizure, hope you and yours work it all out.

  2. I have had many seizures this month . My first. I have a appointment to have a EEG done in hospital. A living nightmare. Un controled moments of my head, upper body, legs and arms. I’m on meds to prevent the seizures. My seizures come one after another. Last ER visit I was given a pill under my tongue and went out in a moment of time. I get a painful headach before a seizure with blurred vision and a feeling of surreal, confusion. I fell in December at work hitting my head on the floor . Since than I have had headachs than one day out of the blue my first seizures. I take my meds daily because I must go to work and be in public. A strange feeling comes over my body. I guess time will tell. Question- do I stop my med befor the EEG?

  3. My seizures began at the age of 30 after an unimaginable trauma (my 7 yr old molested by a family member) and I still have them at 45. Can these tonic clonics be mentally induced? I’ve seen many different physicians, had MRIs and EEGs and tried so many different prescriptions but all they do is make me groggy. I still have at least 1 or 2 a month, and they usually occur right before my menstrual cycle.

    • Amy, you need to speak with a smart neurologist, not some guy on the internet! Wish I could help.

    • Hi Amy, you can have such things as dissociative seizures which are brought on by trauma.
      If that is what you have anti-convulsants aren’t going to help you; Susan O’Sullivan, a neurologist who wrote ‘It is all in your head’ called this type of seizures (trying to remember the exact quote) ‘…the monsters guarding the box’ (the box containing whatever it was you couldn’t bear to process).
      A neuro who suspected dissociative seizures would ask for a psychiatric referral for assessment.
      I’d hunt around for a neuro with some expertise in NEAD/functional seizures/dissociative seizures/psychogenic seizures – different terms for the same thing.
      If you do some googling there are some helpful forums where you should be able to get a better idea of the condition from a patients perspective.
      I have epilepsy, so I can’t really help there.

    • Yes! These could definitely be psychogenic seizures! I am diagnosed with generalized epilepsy but I also went through a period of time where I was getting frequent “tonic-clonics.” Turned out to be psychogenic in nature, no change was noted on my EEG during them. Of course, that could be determined because I was at an epilepsy monitoring unit at the time. Epileptic spikes/waves were visible during the “true” seizures. I felt so embarrassed, like I was faking it even though I found them terrifying and out of my control. My epileptologist is amazing, said they’re quite common, and that most often when people learn they are psychogenic, they stop occurring. And that’s exactly what happened. I still have seizures, but not the psychogenic ones.

  4. Hi,

    I think I passed out. I finished half a bottle of white wine. I was already sleeping om my wife’s lap, but I woke up to pee in the toilet. I think I must have stood up too fast, cause I collapsed even before I got the chance to pee. Fortunately my wife was there to come to my aid as soon as she heard me fall. I felt lightheaded before the fall. I want to believe that I just fainted because of the alcohol and for standing up too soon, but my wife found me with my eyes open. And she said my upper body was stiff. I was unconcious for about 15 seconds. I did not feel confused or impaired when i regained conciousness. I was also not jerking. She said I seemed to froze for 15 seconds. I believe i hit my head on the wall as i fell, cause i feel a bruise, but no bumps. Do you think what I experienced was seizure?

  5. Thank you tons and those who shared videos.
    My husband just had a tonic-clonic seizure and is in hospital for observations and tests.
    So this was very informative.

  6. Sarah Vitberg says

    Is there any information on post ictal psychosis or other post ictal states?

    Thank you for posting these. I have MS and Epilepsy and I wanted to see what other people see.
    When people tell me what it looks like, it always seem more physical than what I see here and I always walk away with mild to serious injuries when it’s over (bring of chunks of tongue, chipping jaw bones, bruises from my hands hitting my legs, etc.)

    One more question, is there any information about status epilepticus?
    I have Nuero’s and am in palliative care but find so many questions unanswered, I stumbled across this in the early morning.
    I have diagnosis and I’m not looking for medical help, just want to know more about what’s happening without going down a google rabbit hole.

    • Hi Sarah. Most patients will be confused, altered, or unresponsive for a short time after a seizure, but it certainly varies. That period is called the post-ictal state.

      Status epilepticus is essentially a seizure that does not end on its own. It’s considered a medical emergency as it can last many minutes (even hours) without medical intervention and prolonged seizure can damage the brain.

  7. I’ve had seizures since I was two years old getting worse as I age I need help with medical, Finance, housing and counseling. Who will help me???

  8. Brenna Connors says

    My daughters eyes will randomly roll back while she remains conscious, but it is a total involuntary movement. Sometimes hours will pass without a single tick but sometimes it happens every 10-30 seconds for a little under an hour. Most of the time it happens about 1-3 times every five minutes. She would complain every couple months or so about this when she was around 11-14 but now in her later teens it has gotten much worse. Is it possible that these are small partial seizures?

    • I have tics and epilepsy… Trying to stop a tic increases the pressure to “perform” the tic. With a seizure, you can’t “will” yourself into having one or into making it stop. A tic is essentially a compulsion. I have a tic thing with my eyes and While the tics happen outside of my control, I can also do the same action at will. BUT trying to NOT do the action can create a lot of internal anxiety and pressure. And by performing the tic there is a sense of relief. Not sure if that helps clarify…?

  9. Phillip Harshaw says

    I would like to know how the person I was with had a seizure and remembers what I said to her cuz I read that they don’t have any memory so I said something kind of drastic just to see if she was faking it because I had an inkling she was and and I just wanted to see if she would say something about that .when she did I said I don’t know what to do should I catch you on fire. And when she came out of it she says why would you tell me you were going to catch me on fire. And she was literally acting like she was kind of shaking and her eyes were closed and she just woke up again

  10. Hi I am 38years old with no history of Epilepsy or seizures. About two weeks ago I spent the day with family shopping etc and I was driving my older sisters new 4wd while it was around 4pm I don’t remember anything except feeling a deja-vue and a hot flush come over me, then I am told I lost consciousness and just stopped driving I started to shake uncontrollably for about 20mins I continued having multiple seizures and all I had consumed was 2 red bull energy cans and I have no memory of anything except waking up in the emergency room feeling like I had been electrocuted. My CT scan taken at emergency was normal and I am awaiting a referral to the Neurologist and have to go back to my GP today for post seizure check up and I have had a head ache that has not gone away since this scary seizure happend & I was wondering if High levels of emotional stress over my current housing homeless situation could be a reason and I have Lupus that has been moderately mild without any flare ups for years. I realise professionals are required for confirming accurately whats wrong with me but until an answer can be given thought id ask on here

    • Hi Lee. You’ll really need to speak with a medical provider (neurology would be a good choice). It could certainly be seizure, or a phenomenon called pseudogenic seizure which is often induced by stress, or other things as well — they’ll be best positioned to assess your situation. Good luck!

Speak Your Mind