Call emergency services immediately if a seizure lasts longer than five minutes, the person is injured, pregnant, or in water, or if it is their first-ever seizure. Otherwise, protect them from injury, cushion the head, loosen anything tight around the neck, time the event, and turn them onto their side once the convulsing stops. Never restrain them or put anything in their mouth. Most seizures stop on their own within one to three minutes, and the correct response is mostly about removing danger and watching the clock.
What Happens in the Brain During a Seizure
A seizure is a sudden, uncontrolled burst of electrical activity among groups of neurons. Normal brain signaling depends on a balance between excitation, driven mainly by the neurotransmitter glutamate, and inhibition, driven mainly by GABA. A seizure occurs when that balance tips hard toward excitation, either because too many neurons fire at once or because the braking system fails.
The visible convulsion most people picture is only one seizure type. Focal seizures start in one brain region; generalized seizures engage both hemispheres. A tonic-clonic seizure has a stiffening phase (tonic) followed by rhythmic jerking (clonic). Absence seizures look like brief staring spells, often mistaken for daydreaming. The behavioral variety matters because what you do depends partly on whether the person stays standing, falls, or remains responsive.
During a generalized convulsion, the body's oxygen demand spikes while breathing may briefly pause or become irregular. Muscle activity is intense and involuntary. This is why the person can look blue around the lips, make unusual sounds, or lose bladder control, none of which means they are choking or dying in that moment.
How Common Seizures Are and How Long They Last
Roughly 1 in 10 people will have at least one seizure in their lifetime, while about 1 in 26 will develop epilepsy, defined as recurrent unprovoked seizures. That gap matters: a single seizure is not the same as epilepsy.
Most seizures are brief. A typical generalized tonic-clonic seizure lasts one to three minutes. The medical definition of status epilepticus, a seizure emergency, is continuous seizure activity lasting five minutes or more, or repeated seizures without recovery between them. Emergency guidance often uses five minutes as the action threshold precisely because the risk of lasting harm climbs the longer a seizure runs.
After the seizure stops, a postictal phase follows, lasting minutes to hours. The person may be confused, exhausted, headachy, or combative. This recovery period is normal, but it is also when most injuries from falling or wandering happen, so supervision continues after the shaking ends.
Seizure Types and What Each Looks Like
| Feature | Tonic-clonic | Absence | Focal aware | Myoclonic |
|---|---|---|---|---|
| Consciousness | Lost | Briefly impaired | Preserved | Usually preserved |
| Movement | Stiffening then jerking | Subtle staring, blinking | Depends on brain region | Brief shock-like jerk |
| Typical duration | 1–3 minutes | 5–10 seconds | Seconds to minutes | Under a few seconds |
| Fall risk | High | Low | Variable | Moderate |
| First aid focus | Cushion head, time it, recovery position | Gentle guidance, no restraint | Observe, keep safe | Prevent fall injury |
This table is a rough guide, not a diagnostic tool. Seizure types are classified clinically, often with EEG and imaging. The practical point is that first aid scales with fall risk and duration, not with how dramatic the event looks.
Red Flags That Change the Response
Seizure lasts longer than five minutes, or a second seizure begins before the person recovers. The person is pregnant, has diabetes, or the seizure happened in water. Breathing does not return to normal after the convulsion stops. The person is injured, does not wake up within a few minutes, or was already unwell. It is the person's first known seizure, or they have no known epilepsy diagnosis. The seizure occurred with no warning in someone with a known allergy or heat exposure.
These situations warrant emergency help because they raise the risk of prolonged seizure, aspiration, or an underlying reversible cause such as low blood sugar. When in doubt, call. Emergency dispatchers can help you decide while help is on the way.
Common Misconceptions That Cause Harm
The most dangerous myth is that you should put something in the person's mouth to prevent tongue biting. Do not. The jaw muscles are clenched during a tonic-clonic seizure, and objects can break teeth, injure the mouth, or obstruct the airway. The tongue is rarely bitten severely, and any bleeding is usually minor and self-limited.
Another persistent myth is that you must restrain a seizing person. Restraint does not stop the seizure and increases the risk of injury to both people. The same logic applies to trying to sit the person up mid-convulsion.
A counterintuitive professional caveat: a person who is convulsing is generally not at risk of swallowing their tongue, but they can aspirate saliva or vomit during the postictal phase. That is why the recovery position, turning them onto their side once the jerking stops, matters more than most bystanders realize. Timing also matters more than people expect: noting the start time is one of the most useful things a bystander can do, because treatment decisions hinge on duration.
Step-by-Step: What to Do in the Moment
Stay with the person and start timing the seizure. Note the clock time when it begins. If you can, note what the person was doing beforehand and which side of the body moved first, because that detail helps clinicians.
Clear the area of hard or sharp objects. Move furniture if you can do so quickly, and place something soft, such as a folded jacket, under the head. Loosen tight clothing around the neck. Do not hold the person down or insert anything into the mouth.
Let the seizure run its course. Most stop within one to three minutes. Speak calmly and quietly; the person cannot respond during a generalized seizure, but your voice can orient them afterward.
Once the jerking stops, turn the person onto their side into the recovery position, with the lower arm forward and the upper knee bent. This keeps the airway clear if they vomit. Stay with them until they are fully alert, which can take 10 to 30 minutes or longer.
Watch for the red flags above and call emergency services if any apply. If the seizure passes five minutes, call regardless of other factors.
Acting on Thresholds: A Practical Timeline
| Time from onset | What to do |
|---|---|
| 0–30 seconds | Time it, clear hazards, cushion the head |
| 30 seconds–3 minutes | Let it finish, do not restrain, keep watching breathing |
| 3–5 minutes | Prepare to call emergency services; note whether breathing is normal |
| 5 minutes | Call emergency services; this meets the status epilepticus threshold |
| After convulsion stops | Recovery position, monitor breathing, stay until alert |
| 10–30 minutes after | Expect confusion; keep supervising, offer reassurance |
| If no recovery | Emergency care; prolonged postictal state needs evaluation |
The five-minute mark is the most important number to remember, and it aligns across major first-aid guidance. Some sources use slightly different wording for repeated seizures, but the practical trigger is the same: a seizure that will not stop, or one that restarts before recovery, is an emergency.
What Not to Do, and Why It Backfires
Do not put your fingers or any object in the mouth. Do not give food or drink during or immediately after a seizure, because swallowing is unreliable until full awareness returns. Do not leave the person alone right after the shaking stops, and do not let them drive or operate machinery until they are fully recovered and cleared by a clinician.
Do not assume every seizure is epilepsy. Fevers, low blood sugar, alcohol withdrawal, head injury, and certain medications can all provoke seizures. That is why a first seizure usually warrants medical evaluation even when it resolves on its own.
Limits of Bystander First Aid
Bystander action can prevent injury and buy time, but it cannot diagnose the cause or stop a prolonged seizure. Rescue medications exist for known epilepsy patients, often prescribed as nasal sprays or gels, but dosing and use belong to the person's care plan and clinician, not to a bystander guessing.
This article describes general mechanisms and first-aid principles. It is educational information, not a diagnosis or treatment plan, and it cannot replace evaluation by a qualified clinician. For any seizure that is prolonged, injurious, or a first occurrence, contact local emergency services or a medical professional promptly.