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EnglishWhat Is Mal de Débarquement Syndrome (MdDS) and What Are Its Symptoms?
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Mal de Débarquement Syndrome (MdDS) is a neurological disorder that leaves patients feeling as if they are rocking and swaying, as though they are on an invisible boat. The MdDS Foundation describes it as a condition of constant perceived motion. If you have recently been on a car, train, airplane, ship, boat, or even a fast elevator and still feel like you are moving long after you stopped, MdDS is one possibility worth understanding — though only a clinician can diagnose it.
What MdDS Is
MdDS is a disorder of persistent motion perception. The MdDS Foundation frames it as "the natural result of the human brain adapting to environmental motion," which is why it is described as a quintessential neurological disorder. In plain terms: your brain adjusted to motion while you were traveling, and it has not fully readjusted to stillness.
The Foundation's site notes that many people are suffering from MdDS without knowing it — they remain undiagnosed.
Common Triggers
MdDS is typically triggered by motion. According to the MdDS Foundation, triggers include:
- Cars
- Trains
- Airplanes
- Ships and boats
- Fast elevators
The pattern to notice is a trip or motion exposure followed by symptoms that do not resolve on their own.
What the Symptoms Feel Like
The core symptom is a continuous sensation of rocking and swaying — feeling in motion even when you are still. The Foundation's own framing is direct: "Imagine always feeling in motion."
Because symptom intensity varies widely between people, the Foundation offers a visual aid to help others see your symptom severity on a scale from 0 to 10, under the heading "Know Your Numbers." This can be useful when explaining your experience to family, employers, or clinicians who cannot see what you feel.
Why Diagnosis Is Often Delayed
The MdDS Foundation reports that the average person sees 20 or more doctors before receiving a diagnosis. That number is worth keeping in mind if you are early in the process and feel like you are not being understood — a long search is unfortunately common, not evidence that nothing is wrong.
How the MdDS Foundation Website Helps
The site is organized around the practical needs of patients and the people around them:
| Section | What it offers |
|---|---|
| About & FAQ | Background on the disorder |
| Symptoms | What to look for |
| How to Diagnose | Information on the diagnostic path |
| Living with MdDS / Coping Tips | Day-to-day management |
| Find Support | Community connection |
| Professional Resources | Material for clinicians |
| Latest Research | Current studies |
| Watch Our Explainer Video | A visual introduction to the disorder |
| Faces of MdDS | Patient stories, including "Finding My Footing: How I Regained Control After an MdDS Diagnosis" |
The Foundation also maintains a global patient registry, which it describes as a way to help answer important questions about the natural history of MdDS. Participating in a registry is one way patients contribute to research that is currently underfunded relative to the scale of the problem.
Research Funding Context
The MdDS Foundation has partnered with the American Brain Foundation to offer the Next Generation Research Grant (NGRG) in Mal de Débarquement Syndrome — a two-year, $150,000 award supporting early-career researchers studying MdDS disease mechanisms or translational research aimed at developing treatments.
What to Do Next
If the description above matches your experience — persistent rocking or swaying after travel that has not settled — the Foundation's explainer video and symptom pages are a reasonable starting point for language you can bring to a doctor. Use the 0-to-10 severity scale to make your symptoms concrete, and consider the support and registry sections if you want to connect with others or contribute to research.