While the effects typically clear up in a few hours after returning to land, they can last for as long as two days. Symptoms can also return, or increase in intensity, if the condition is triggered.
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Within a day or so, your land legs likely will return and the symptoms will disappear. However, for a rare few returning vacationers, this persistent sensation of motion or dizziness can continue for weeks or even longer. The disorder is called mal de debarquement syndrome.
The disorder is called mal de debarquement syndrome. “It is a phenomenon that isn't fully understood,” says audiologist Julie Honaker, PhD CCC-A, Director of Cleveland Clinic's Vestibular and Balance Disorders Laboratories. “We think it may have to do with the brain rather than the inner ears.”
Disembarkment syndrome is a medical condition that may occur following a sustained motion event like an aircraft flight or cruise. It is a neurological condition that is normally diagnosed by a neurologist when the sufferer reports a persistent swaying, rocking, or bobbing sensation.
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Translated as “sickness of disembarkment,” mal de debarquement syndrome (MdDS) is the illusion of movement after movement has stopped. It is caused by exposure and then removal of movement. Many people deal with MdDS after air or sea travel. Typically, MdDS resolves itself within 24 hours.
Flying does two things that are relevant to dizziness-- it may induce motion sickness, and it may stimulate the ear through pressure changes. There is a small literature about alternobaric vertigo. In small planes, dizziness may come from either or both mechanisms.
When you get back on shore, you need time to get your land legs back. That usually happens within a few minutes or hours, but it can take up to 2 days. With mal de debarquement syndrome, though, you can't shake the feeling that you're still on the boat.
Once back on shore, most people “get their land legs back” within two days. People with MdDS still feel like they're rocking and swaying, even though they're no longer on a ship. Less common MdDS triggers include: Flying in a plane.