Many people with epilepsy experience warning signs before a seizure, ranging from vague mood changes hours in advance to vivid sensory disturbances in the final seconds. These pre-seizure feelings fall into two distinct phases: a prodrome that can begin hours or even days beforehand, and an aura that strikes within the last minute. Not everyone gets these warnings, but roughly one in five people with epilepsy reports them consistently enough to recognize a pattern.
The Two Phases of Pre-Seizure Warning
The earliest warning signs belong to what neurologists call the prodrome. This is a slow-building shift in how you feel, typically lasting anywhere from 30 minutes to 24 hours before a seizure, though some people notice changes up to three days in advance. Prodromal symptoms are vague and easy to dismiss: irritability, anxiety, confusion, or just a hard-to-describe “funny feeling” that something is off. In studies tracking these symptoms, anxiety and irritability are among the most commonly reported, each showing up in about 8 to 9 percent of patients.
The aura is different. It happens in the final minute before a seizure and produces much more specific, intense sensations. Auras are actually small seizures themselves, classified as focal aware seizures because the electrical activity is still limited to one part of the brain and you remain conscious throughout. What you feel during an aura depends entirely on which part of the brain is involved.
What an Aura Actually Feels Like
The most commonly described aura sensation is a rising feeling in the stomach, similar to the drop on a roller coaster but without any physical cause. This is especially typical of seizures that start in the temporal lobe. Some people describe it as a wave of nausea or butterflies that climbs from the abdomen toward the chest and throat.
Visual disturbances are another frequent aura type. These can include flashing lights, colored spots, or changes in how things look, such as objects appearing larger, smaller, or distorted. Unusual smells or tastes that come from nowhere, often described as metallic, burnt, or chemical, are also well-documented aura symptoms. These tend to be brief and intense.
Perhaps the strangest pre-seizure experiences are the cognitive and emotional ones. A sudden, overwhelming sense of déjà vu, the feeling that you’ve lived through this exact moment before, is one of the hallmark signs of a temporal lobe seizure. The opposite sensation, called jamais vu, makes familiar surroundings feel completely alien. Some people report a sudden wave of intense fear or, less commonly, an unexpected surge of joy, both striking without any obvious trigger.
Why Different People Feel Different Things
The specific sensation you experience before a seizure is a reliable clue to where in the brain the seizure starts. Visual symptoms like flashing lights point to seizure activity in the back of the brain, where visual processing happens. The rising stomach feeling and emotional changes like fear or déjà vu are strongly linked to the temporal lobe, which handles memory and emotion. Tingling or numbness on one side of the body suggests the seizure begins in the area that processes touch. The match between aura type and brain location is so consistent that neurologists consider it as useful for pinpointing the seizure’s origin as brain imaging or electrical recordings.
People whose seizures originate in the temporal lobe are the most likely to report auras. Those with seizures starting in the frontal lobe often have little or no warning because frontal lobe seizures tend to spread quickly, leaving almost no window of awareness before consciousness is affected.
How Often People Get Warnings
Not everyone with epilepsy experiences pre-seizure feelings. Data from the American Epilepsy Society shows that about 22 percent of epilepsy patients report auras. Interestingly, people with generalized epilepsy (where seizures affect the whole brain at once) reported auras at a slightly higher rate, 25 percent, compared to 18 percent of those with focal epilepsy. This was a somewhat unexpected finding, since auras were traditionally thought to occur mainly in focal seizures.
For the prodromal phase, studies found a similar prevalence of about 22 percent. Some people reliably experience a prodrome before every seizure, while others only notice it occasionally. The consistency varies, but those who do get consistent warnings often learn to use them as a cue to get to a safe place, sit or lie down, and alert someone nearby.
When There Is No Warning at All
The majority of people with epilepsy, roughly four out of five, do not report reliable pre-seizure symptoms. Some seizure types, particularly generalized tonic-clonic seizures that start across the entire brain simultaneously, can hit without any preceding sensation. In these cases, the first sign of a seizure is the seizure itself. Others may have subtle warning signs they haven’t learned to recognize yet. Seizure diaries and tracking apps can help identify patterns over time, such as a link between poor sleep, stress, or mood shifts and seizure occurrence, even when a clear aura is absent.
For people who do experience consistent pre-seizure feelings, those sensations become an important part of managing their condition. Recognizing a prodrome or aura gives a narrow but real window to prepare, whether that means stopping a car, moving away from stairs, or simply sitting down before awareness is lost.