Having a seizure feels different depending on the type, but most people describe some combination of lost time, strange sensations, confusion, and physical exhaustion. Up to 10% of people worldwide will experience at least one seizure in their lifetime, and the experience ranges from a brief blank stare lasting a few seconds to full-body convulsions followed by deep fatigue. What surprises many people is that seizures aren’t always dramatic, and the person having one often has no memory of it afterward.
What Happens in the Brain
A seizure occurs when groups of brain cells become hyperexcitable and start firing in unison, far faster than normal and without the usual rest periods between signals. Normally, neurons fire in coordinated but varied patterns. During a seizure, clusters of neurons lock into the same rhythm simultaneously, amplifying whatever signal they’re producing. If this happens in one small region of the brain, you might experience an odd smell or a twitching hand. If it spreads across the entire brain, you lose consciousness and your whole body seizes up.
The Warning Phase: Auras
Many people get a warning sign seconds to minutes before a seizure. This is called an aura, and it’s actually a small seizure in itself, confined to one part of the brain. What it feels like depends on which brain region is involved.
One of the most commonly described sensations is a rising feeling in the stomach, similar to the drop on a roller coaster. Others experience sudden, intense emotions like fear or joy that seem to come from nowhere. Some people smell something that isn’t there, like burning rubber or flowers. Others taste metal, hear buzzing or music, or see flashing lights or distorted shapes. Déjà vu is another classic aura: the overwhelming feeling that you’ve lived through this exact moment before. The opposite also happens, called jamais vu, where familiar surroundings suddenly feel completely foreign, as though you’ve never seen your own kitchen.
Not everyone gets auras. For some people, the seizure hits without any warning at all.
Focal Aware Seizures: Conscious but Not in Control
In a focal aware seizure, you stay conscious the entire time but can’t control what’s happening. Your arm might jerk rhythmically, or one side of your face might twitch. You might feel tingling spreading across your skin, waves of nausea, or sudden dizziness. Emotions can surge without reason: a jolt of fear, sadness, or even euphoria.
Some people experience vivid hallucinations during these episodes. They might hear voices, see things that aren’t there, or smell something unusual. Throughout all of this, you’re aware that something is wrong but often can’t speak or call for help. These seizures typically last under two minutes, and afterward you can usually remember exactly what happened, which can be frightening in its own way.
Focal Impaired Awareness Seizures: The Lost Minutes
These seizures affect consciousness. From the outside, the person might stare blankly, smack their lips, fidget with their clothing, or wander aimlessly. From the inside, there’s very little “inside” to describe. Most people have no memory of the episode at all, or recall only fragments: a vague sense of confusion, a dreamlike feeling, or simply a gap in time.
The disorienting part comes afterward. You might “wake up” in a different room than you remember being in, with people staring at you, and have no idea what just happened. Some people initially think they just zoned out or daydreamed. Others feel a deep sense of dread during the seizure that they can’t fully articulate later. These episodes also typically last one to two minutes, but the confusion that follows can stretch much longer.
Absence Seizures: Blink and You Miss It
Absence seizures are the subtlest type. They last between 3 and 15 seconds and look like the person simply stopped mid-sentence or mid-step. There’s a blank stare, sometimes with eyelid fluttering or small lip-smacking movements, and then the person picks up right where they left off with no idea anything happened. Children experience these more often than adults, and they can happen dozens of times a day. The person having them usually has zero awareness that any time passed. To them, the conversation never paused.
Tonic-Clonic Seizures: The Full-Body Experience
This is what most people picture when they think of a seizure. It unfolds in two distinct phases. In the tonic phase, every muscle in the body suddenly stiffens. The person loses consciousness instantly, often falling to the ground. Air forced through tightened vocal cords can produce a groan or cry that sounds alarming but isn’t a sign of pain, since the person is unconscious. This phase lasts about 10 to 20 seconds.
Then the clonic phase begins. The arms and legs start jerking rhythmically as muscles rapidly contract and relax. Breathing can become irregular. The jaw may clench. This phase usually lasts one to two minutes. The person experiencing it has no awareness during either phase. They won’t remember falling, the convulsions, or anything anyone said to them.
What they will remember is the aftermath.
The Recovery Period
The postictal state, the recovery window after a seizure, is often the part people find most distressing. On average it lasts between 5 and 30 minutes, though it can stretch to hours or even days after severe seizures. Common symptoms include deep exhaustion, confusion, sore muscles, headache, and difficulty remembering things.
Many people describe the confusion as feeling like waking up from anesthesia. You might not recognize where you are, struggle to form sentences, or feel emotionally fragile. Some people cry without understanding why. The muscle soreness can feel like you ran a marathon, because during a tonic-clonic seizure, your muscles contracted far harder than they would during voluntary movement. Some people bite their tongue or cheek during the seizure and only discover it afterward from the soreness or taste of blood.
The fatigue after a seizure is profound and qualitatively different from normal tiredness. Many people need to sleep for hours. Memory of events leading up to the seizure may be patchy or completely absent.
Seizures That Aren’t Electrical
Some episodes look and feel like seizures but aren’t caused by abnormal electrical activity in the brain. These are called psychogenic nonepileptic seizures, or functional seizures. They can involve full-body shaking, loss of awareness, and convulsive movements, and they’re genuinely involuntary. The person isn’t faking. The difference is the underlying cause: these seizures are driven by the nervous system’s stress response rather than by misfiring neurons.
There are some patterns that distinguish them. Functional seizures more often involve eyes-closed unresponsiveness, out-of-sync limb movements, side-to-side head shaking, and episodes lasting longer than 10 minutes. An EEG during a functional seizure shows normal brain activity, while an epileptic seizure produces clearly abnormal electrical patterns. The distinction matters because the treatments are completely different.
Common Seizure Triggers
For people with epilepsy, seizures don’t always strike randomly. The most frequently reported triggers are stress and sleep deprivation. Missed medication is another major one. Beyond those, fever, fasting (which drops blood sugar), alcohol use or withdrawal, and certain infections can lower the seizure threshold.
Flashing or flickering lights trigger seizures in some people with generalized epilepsy, a phenomenon called photosensitivity. Caffeine can contribute, especially when it disrupts sleep. For some women, seizures cluster around menstruation due to hormonal fluctuations, a pattern known as catamenial epilepsy. Even less obvious activities like bathing, eating, or reading can trigger seizures in rare forms of reflex epilepsy.
When a Seizure Becomes an Emergency
Most seizures end on their own within a couple of minutes. According to the CDC, you should call 911 if a seizure lasts longer than 5 minutes, if a second seizure follows closely after the first, if the person has trouble breathing or waking up afterward, or if they were injured during the episode. A seizure happening in water is also an emergency. The same applies if it’s the person’s first seizure ever, if they’re pregnant, or if they have diabetes and lose consciousness.