Which are the causes of Mal de debarquement?

TL;DR: Mal de debarquement syndrome (MdDS) is a rare neurological condition characterized by a persistent sensation of rocking, swaying, or bobbing that typically begins after exposure to passive motion, such as a cruise or flight. While the exact cause remains unknown, current research points to a maladaptation of the brain’s vestibular-ocular system, which fails to "reset" after the motion stimulus ceases.

What triggers the onset of Mal de debarquement?

The hallmark of Mal de debarquement is the onset of symptoms following a period of passive motion. Most individuals report that their symptoms began after traveling by boat, plane, or car. However, it is important to distinguish between the trigger (the motion event) and the underlying etiology. While most cases are "motion-triggered," a smaller subset of patients experiences spontaneous onset, where Mal de debarquement symptoms emerge without any prior travel. This suggests that the condition involves an underlying vulnerability in how the brain processes spatial orientation and movement, which is then unmasked by a motion event.

Are there genetic or biological risk factors for Mal de debarquement?

To date, there are no specific genes or chromosomal mutations identified as the direct cause of Mal de debarquement. Clinical geneticists view this as a complex, multifactorial condition rather than a simple Mendelian disorder. Current research into the pathophysiology of Mal de debarquement focuses on the following mechanisms:

• Vestibular-Ocular Reflex (VOR) Dysfunction: The brain’s ability to stabilize gaze during head movement may be improperly calibrated.


• Central Nervous System Plasticity: The brain may be "over-learning" the movement pattern during travel and failing to discard that pattern upon returning to solid ground.


• Hormonal Influences: Epidemiological data indicates a significantly higher prevalence of Mal de debarquement in women, particularly those in the perimenopausal or menopausal age range, suggesting that hormonal fluctuations may modulate the vestibular system.


• Migraine Association: There is a documented clinical overlap between Mal de debarquement and vestibular migraine, suggesting that patients with a history of migraine may have a lower threshold for developing these persistent symptoms.

Is the cause of Mal de debarquement fully understood?

No, the etiology of Mal de debarquement is not fully understood. Medical researchers are currently investigating whether the issue resides in the inner ear (peripheral vestibular system) or the brain (central vestibular pathways). Most evidence currently points toward a central mechanism involving the brain’s internal "map" of motion. Think of it like a computer program that continues to run in the background after the user has closed the window; in Mal de debarquement, the brain’s internal sensor for motion remains "on" even when the body is perfectly still.

How do researchers study the causes of Mal de debarquement?

Current research efforts are shifting toward functional neuroimaging (such as fMRI and PET scans) to observe brain activity in patients with Mal de debarquement. By comparing the brain activity of Mal de debarquement patients against healthy controls during motion simulations, researchers hope to identify the specific neural circuits that fail to habituate. At DiseaseMaps.org, our community of 11 members provides valuable anecdotal data that helps researchers understand the real-world impact and commonalities among those living with this condition.

Next steps

• Consult a neuro-otologist or a neurologist who specializes in vestibular disorders to rule out other conditions like Meniere's disease or vestibular neuritis.


• Keep a detailed symptom diary to identify if hormonal cycles, stress, or specific environments exacerbate your Mal de debarquement.


• Connect with the Mal de debarquement community at DiseaseMaps.org to share experiences and learn about ongoing clinical research trials.


• Discuss vestibular rehabilitation therapy (VRT) with your doctor, though note that standard VRT is often less effective for Mal de debarquement than for other vestibular disorders.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Mal de debarquement syndrome overview.


• Orphanet: Rare disease database entry for Mal de debarquement syndrome.


• Journal of Neurology, "The Pathophysiology of Mal de Debarquement Syndrome," PubMed Central.


• MdDS Balance Disorder Foundation: Patient-focused clinical research and support resources.