What Causes Deja Vu? The Brain Misfire Behind a Strange Feeling
You walk into a new place and feel you have been there before. That feeling has a name.
What it is
Cleveland Clinic describes deja vu, French for "already seen", as a fleeting sensation of having already lived a situation, when in reality you have not. It estimates that 97% of people have felt it at least once. Neurologist Jean Khoury, MD, calls it a false sense of familiarity. You feel a situation is familiar while also knowing it should not be.
What may cause it
Dr. Khoury says deja vu is caused by dysfunctional connections between the parts of the brain involved in memory recollection and familiarity, a misfire that blurs the line between memory and a new experience. Cleveland Clinic notes that researchers are not exactly sure why some people are more prone to it. Some suggest people may be more susceptible if they have a high level of education, travel a lot or remember their dreams.
When it is linked to health conditions
Cleveland Clinic says deja vu can be linked to tiredness or lack of sleep, stress and anxiety, migraines, frontotemporal dementia and temporal lobe seizures. Seizures limited to the temporal lobe can cause the feeling without shaking or other movement symptoms, it says.
How often is normal
Dr. Khoury says deja vu is an occasional experience in healthy people, usually a couple of times a year.
When to get help
Cleveland Clinic says to see a provider if it happens often, lasts longer than a few seconds, or comes with symptoms like confusion, headaches, loss of awareness, weakness, seizures or shaking. This is general information, not medical advice.
Sources
- Cleveland Clinic, That Strange Feeling of Deja Vu, Explained (June 17, 2025): https://health.clevelandclinic.org/deja-vu-what-it-is-and-when-it-may-be-cause-for-concern
Facts checked: October 13, 2026.