Mal de Débarquement Syndrome (MdDS): Symptoms, Causes, and Treatment
If you've stepped off a cruise ship, airplane, or even a long car ride and felt like the ground was still moving beneath you, and that feeling just won't go away… you may have something called Mal de Debarquement Syndrome, or MdDS. As a vestibular therapist, I see patients with this condition, and I know how confusing and frustrating it can be. Let's talk about what MdDS is, what we know about it, and what can help.
What is MdDS and Why do I Feel Like I’m on a Boat?
Mal de Debarquement literally means "sickness of disembarkation" in French. It's a condition where you feel a persistent sensation of rocking, swaying, or bobbing (like you're still on a boat) even when you're standing on solid ground.
Here's the thing: almost everyone has experienced a brief version of this after a cruise or long flight. That wobbly "sea legs" feeling usually goes away within hours or a couple of days. But for some people, it doesn't. When symptoms persist for more than a month, we call it MdDS.
Who Gets MdDS?
MdDS most commonly affects:
Women (about 80% of cases)
People in their 40s and 50s
Those with a history of migraine (headaches, ocular, or vestibular migraine)
The most common trigger is water travel (cruises, boats), but it can also happen after flights, long car rides, or even train travel. In some cases, MdDS can start without any obvious motion trigger at all, which is called "spontaneous onset" MdDS.
What Does MdDS Feel Like?
The hallmark symptom is a constant sensation of motion, typically described as one or more of:
Rocking (forward and backward)
Swaying (side to side)
Bobbing (up and down)
Many patients also experience:
Difficulty concentrating or "brain fog"
Fatigue
Sensitivity to busy visual environments (grocery stores, scrolling screens)
Anxiety or depression related to the ongoing symptoms
One of the most distinctive features of MdDS is that symptoms often improve when you're back in motion, such as driving a car or riding in a vehicle. This is the opposite of most dizziness conditions, where motion makes things worse, such as PPPD .
MdDS and PPPD can feel similar, but there are key differences:
MdDS is usually triggered by prolonged passive motion (boat, plane, road trip)
PPPD is often triggered by a vestibular episode (vestibular neuritis, BPPV, vestibular migraine) or particularly stressful event
What Causes MdDS?
We don't fully understand the cause yet, but researchers believe MdDS involves the brain's balance system getting "stuck" in a pattern it developed to adapt to motion. When you're on a boat, your brain learns to predict and compensate for the rocking. Normally, your brain "unlearns" this adaptation once you're back on land. In MdDS, that unlearning doesn't happen properly.
The specific mechanism is described as the “velocity storage mechanism” located in the vestibular nuclei of the brain stem and parts of the cerebellum (think of these as part of our orientation toolbox.) This mechanism helps us store and get used to repetitive or continuous motion so that we aren’t constantly aware of it. Theories also suggest involvement of the vestibulo-ocular reflex (the connection between your inner ear and eye movements) and areas of the brain involved in spatial orientation and motion perception.
What About Standard Vestibular Therapy?
Here's something important to understand: traditional vestibular rehabilitation or balance therapy (the kind that works so well for conditions like vestibular neuritis or BPPV) does not appear to be effective for MdDS. In fact, some studies show that standard vestibular exercises can make symptoms worse in MdDS patients.
This doesn't mean therapy can't help, it just means we need a different, specialized approach.
What Treatments Can Help?
VOR Readaptation Therapy or The “Dai Protocol”
The most promising treatment developed specifically for MdDS is called VOR (vestibulo-ocular reflex) readaptation (also known as the “Dai Protocol”.) This novel approach was developed by Dr. Mingjia Dai, PhD and associates at Mount Sinai’s Icahn School of Medicine. This specialized protocol involves:
Watching a rotating visual pattern (optokinetic stimulation)
While gently rolling your head side to side at a specific rhythm
The goal is to help your brain "reset" the maladapted motion pattern. Studies show that about 70% of patients experience significant improvement with this treatment, and some achieve complete remission. The treatment (as studied) requires multiple sessions over several days at a specialized center in New York, however modifications allow for successful treatment in the home environment as well.
Important notes about VOR readaptation:
Earlier treatment tends to work better than waiting years
Travel (especially by air) shortly after treatment may cause symptoms to return
Not all vestibular providers offer this specialized protocol
Medications
While no medication cures MdDS, some can help manage symptoms:
Benzodiazepines (like clonazepam) help more than 50% of patients
Antidepressants (SSRIs, SNRIs like venlafaxine) can reduce symptoms
Migraine preventive medications may help, especially if you have a history of migraines
Lifestyle Strategies
Stay active—gentle exercise and walking can help
Limit time in visually busy environments when possible
Manage stress, as it often worsens symptoms
Connect with support groups. MdDS can feel isolating, and talking to others who understand can help
What's the Outlook?
The natural history of MdDS varies:
About half of episodes lasting more than a month resolve within a year
The longer symptoms persist, the less likely they are to resolve completely on their own
Many patients experience significant improvement with treatment, even if some symptoms remain
Some patients have recurrent episodes, especially after new motion exposure
The good news is that MdDS is increasingly recognized by the medical community, and research is ongoing. More providers learn about the condition every day, and new approaches including brain stimulation techniques are being studied.
A Final Word
Living with MdDS can be incredibly challenging. The constant sensation of motion is exhausting, and it can be discouraging when doctors aren't familiar with your condition. But please know: MdDS is real, it's increasingly understood, and there are treatments that can help. You're not alone, and there is hope.
At StillPoint Balance & Dizziness, I help my clients in Austin and across Texas understand and recover from persistent dizziness conditions such as MdDS and PPPD. I have successfully treated many individuals with MdDS using techniques that continue to be refined by researchers and providers alike. I have attended seminars on MdDS and other forms of persistent dizziness in order to advocate for those with the conditions and offer the best care possible.
If you're struggling with persistent rocking or swaying sensations after travel, take the first step and reach out for a free consultation. The sooner you get the right diagnosis and treatment, the better your chances of improvement.
This information is intended for educational purposes and should not replace medical evaluation or diagnosis. If you are experiencing new or severe dizziness, consult a qualified healthcare professional.
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Mal De Debarquement Syndrome: A Matter of Loops?.
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Comprehensive Clinical Profile of Mal De Debarquement Syndrome. Frontiers in Neurology. 2018. Cha YH, Cui YY, Baloh RW.
Treatment of the Mal De Debarquement Syndrome: A 1-Year Follow-Up. Frontiers in Neurology. 2017. Dai M, Cohen B, Cho C, Shin S, Yakushin SB.
Questioning the Impact of Vestibular Rehabilitation in Mal De Debarquement Syndrome. Audiology & Neuro-Otology. 2022. Cedras AM, Moin-Darbari K, Foisy K, et al.
