Many people experience recognizable warning signs in the minutes, hours, or even days before a seizure. These warnings fall into two categories: a prodrome, which is a set of subtle changes that can begin hours before a seizure, and an aura, which is a brief sensory or emotional shift that occurs in the seconds to minutes right before one. Not everyone gets these warnings, but research suggests they’re more common than many people realize. In studies using detailed questionnaires, roughly 64% of people with generalized epilepsy and 68% of those with focal epilepsy reported experiencing at least one type of aura.
The Prodrome: Early Warnings Hours Ahead
The prodrome is the earliest phase of warning and can start anywhere from 30 minutes to several hours before a seizure. These symptoms tend to come on gradually rather than all at once, and they’re often vague enough that people don’t connect them to seizures right away. Common prodromal symptoms include headache, nausea, dizziness, numbness, tingling, and general mood changes.
Because these feelings are so nonspecific, many people only recognize them as a pattern after tracking their seizures over time. You might notice, for example, that you consistently feel irritable, foggy, or unusually tired in the hours before a seizure. These aren’t the seizure itself. They’re your nervous system signaling that something is building.
The Aura: Seconds to Minutes Before
An aura is actually the very beginning of a seizure, specifically a focal aware seizure, meaning the electrical activity has started in one part of the brain but you’re still conscious and aware. The specific sensation you feel depends on which area of the brain is involved, so auras vary widely from person to person but tend to be consistent for each individual.
Auras are often difficult to put into words. The Mayo Clinic describes them as “feelings that are hard to describe,” and many people echo that. Still, they generally fall into a few recognizable categories.
Sensory Changes
You might smell something that isn’t there, taste something metallic or strange, see flashing lights or blurred vision, or hear sounds that no one else hears. These phantom sensations can be vivid and feel very real, even though there’s no external source.
Emotional Shifts
A sudden, intense wave of fear or panic is one of the most commonly reported auras. Some people feel a sense of impending doom, while others experience unexpected euphoria. These emotions come on abruptly and feel disconnected from whatever is actually happening around you.
Cognitive Distortions
Déjà vu, the strong feeling that you’ve lived through this exact moment before, is a classic seizure aura. The opposite experience, called jamais vu, can also occur. That’s when something completely familiar suddenly feels foreign or unrecognizable. Some people describe racing thoughts or a sensation that their thinking has shifted in a way they can’t quite articulate.
Physical Sensations
A rising feeling in the stomach, sometimes compared to the drop on a roller coaster, is one of the most well-known physical auras. Tingling or numbness in a specific part of the body, dizziness, and involuntary twitching or jerking of one arm or leg are also common. Some people feel nauseous or experience a general sense of physical strangeness that’s hard to pin down.
Triggers Are Different From Warnings
It’s easy to confuse seizure triggers with seizure warnings, but they serve different roles. Triggers are external or behavioral factors that increase the likelihood of a seizure happening. Common ones include sleep deprivation, stress, missed medications, alcohol, flashing or bright lights, menstruation, and anxiety. Triggers don’t cause epilepsy, but they can set off seizures in people who have it.
Warnings, on the other hand, are internal signals that a seizure is already on its way. The distinction matters because triggers are things you can try to avoid or manage proactively, while warnings are signals to act on immediately for safety. Ideally, you’re paying attention to both.
Why Your Specific Aura Matters
The type of aura you experience gives your neurologist real information about where in the brain your seizures originate. A visual aura, for instance, points toward the back of the brain, while a rising stomach sensation is closely associated with temporal lobe activity. Describing your aura in detail can help with diagnosis, treatment decisions, and, in some cases, evaluating whether epilepsy surgery might be effective.
This is one reason doctors ask for such specific descriptions. Even auras that feel impossible to explain in words are worth attempting to describe, because subtle differences between them can help distinguish between seizure types that look similar on the surface but originate in different brain regions.
How to Track Your Warning Signs
A seizure diary is the single most useful tool for identifying your personal warning pattern. At a minimum, record three things every time: the type of seizure, how often they occur, and which days they happen. Beyond that, note the time of day, how long it lasted, what you were doing beforehand, and any possible triggers like poor sleep, stress, or a missed dose of medication.
The part that matters most for recognizing future warnings is recording exactly what you felt before the seizure started. Write it down as soon as you’re able, while the details are still fresh. Over weeks or months, patterns often emerge. You might discover that you always get the same odd taste, or that you feel inexplicably anxious for an hour beforehand, or that a specific tingling sensation precedes every event. Once you know your personal pattern, you gain a window of time to act.
Also track your mood, sleep quality, and menstrual cycle if applicable. Seizure clusters, sometimes defined as two or more seizures within six hours, may have their own distinct warning patterns that differ from isolated seizures.
What to Do When You Recognize a Warning
If you learn to recognize your prodrome or aura, you can use that window to get physically safe. The priority is reducing the risk of injury from a fall or loss of awareness.
- Get to the ground or sit down immediately. If you’re standing, lower yourself to the floor or sit in a sturdy chair. Avoid stairs.
- Move away from hazards. Step back from traffic, water, sharp edges, stoves, or anything hot. If you’re swimming, get out of the water or alert your buddy.
- Tell someone nearby. If anyone is with you, let them know a seizure may be coming so they can help keep you safe and time the event.
- Put down anything dangerous. If you’re holding a knife, a baby, or driving a vehicle, stop and secure yourself and others.
For longer-term safety, make environmental changes at home. Pad sharp corners on furniture, avoid scatter rugs, use non-slip surfaces, and keep commonly needed items on every floor so you don’t have to use stairs alone. Cook on back burners or use a microwave when possible. Take showers instead of baths, and consider a shower chair if you fall during seizures. If you have a young child, change diapers on the floor and use a stroller to carry the baby around the house rather than holding them in your arms.
When Warnings Don’t Happen
Not everyone gets a warning before a seizure. When asked an open-ended question about auras, only about 21% of people with generalized epilepsy spontaneously mentioned one. The number jumped to 64% when they were prompted with specific examples, which suggests many people do have subtle warnings but don’t recognize them as such. If you’ve never noticed a warning sign, it’s worth reviewing a detailed list of aura types with your neurologist. You may be experiencing something you’ve been dismissing as random or unrelated.
Some seizure types, particularly those that begin with a sudden loss of consciousness, genuinely offer no warning at all. In those cases, safety planning and consistent medication become even more important, since there’s no built-in window to prepare.