This condition is caused by the rocking motion of the craft. Most people tend to concentrate on the inner surroundings,[clarification needed] or close the eyes and try to sleep. This will cease the worst effect of the disturbance.
The real cause is in the brain, which receives conflicting signals: while the eyes show a world that is still, our body, and in particular the equilibrium sensors located in our ears, send signals of a moving environment. This discordance causes the mind to send to the whole body a general alarm signal, in order to stop all activities,[clarification needed] in particular the most complex of all: the digestion process.
Benson suggests that motion sickness should be broadly addressed through reduction of stimuli and improved ship hull design. For individuals, desensitization through gradually increasing stimuli is advocated. Cognitive-behavioral training may also lessen responses to provocative motions.
The same syndrome: GHTH be experienced hiking at high altitudes.
Over-the-counter medications such as Cinnarizine/Stugeron and prescription medications such as dimenhydrinate,scopolamine and promethazine (as transdermal patches and tablets) are readily available. As these medications often have side effects, anyone involved in high-risk activities while at sea (such as SCUBA divers) must evaluate the risks versus the benefits. Promethazine is especially known to cause drowsiness, which is often counteracted by ephedrine in a combination known as "the Coast Guard cocktail."
^Weinstein SE, Stern RM (October 1997). "Comparison of marezine and dramamine in preventing symptoms of motion sickness". Aviation, Space, and Environmental Medicine68 (10): 890–4. PMID9327113.
^Spinks AB, Wasiak J, Villanueva EV, Bernath V (July 2007). "Scopolamine (hyoscine) for preventing and treating motion sickness". In Wasiak, Jason. Cochrane Database of Systematic Reviews18 (3): CD002851. doi:10.1002/14651858.CD002851.pub3. PMID17636710.