This article is about the type of motion sickness. For other uses, see Seasick
Seasickness is a form of motion sickness characterized by a feeling of nausea and, in extreme cases, vertigo, experienced after spending time on a craft on water.
This condition is caused by the rocking motion of the craft. Most people tend to concentrate on the inner surroundings, 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, 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. Motion sickness may be treated using a number of drugs, including scopolamine.
The same syndrome: interruption of digestive process, nausea, headache, vertigo, may happen in other conditions and may bear the same name, erroneously. In scuba diving, while happening deep in the sea, so called seasickness is not caused by motion sickness, Equal syndrome may be experienced hiking at high height.
but by unusual pressure, temperature, stance and medium.
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."
See also 
- ^ a b Benson, Alan J. (2002). "Motion Sickness". In Kent B. Pandoff and Robert E. Burr. Medical Aspects of Harsh Environments 2. Washington, D.C.: Borden Institute. pp. 1048–1083. ISBN 978-0-16-051184-4. Retrieved 4 Dec 2012.
- ^ Weinstein SE, Stern RM (October 1997). "Comparison of marezine and dramamine in preventing symptoms of motion sickness". Aviation, Space, and Environmental Medicine 68 (10): 890–4. PMID 9327113.
- ^ 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 Reviews 18 (3): CD002851. doi:10.1002/14651858.CD002851.pub3. PMID 17636710.
- ^ "Phenergan information". Drugs.com. Retrieved 2009-07-10.
- ^ Schwartz, Henry JC and Curley, Michael D (1986). "Transdermal Scopolamine in the Hyperbaric Environment". United States Navy Experimental Diving Unit Technical Report. Retrieved 2008-05-09.
- ^ Bitterman N, Eilender E, Melamed Y (May 1991). "Hyperbaric oxygen and scopolamine". Undersea Biomedical Research 18 (3): 167–74. PMID 1853467. Retrieved 2008-05-09.
- ^ Williams TH, Wilkinson AR, Davis FM, Frampton CM (March 1988). "Effects of transcutaneous scopolamine and depth on diver performance". Undersea Biomedical Research 15 (2): 89–98. PMID 3363755. Retrieved 2008-05-09.
- ^ Arieli R, Shupak A, Shachal B, Shenedrey A, Ertracht O, Rashkovan G (1999). "Effect of the anti-motion-sickness medication cinnarizine on central nervous system oxygen toxicity". Undersea and Hyperbaric Medicine 26 (2): 105–9. PMID 10372430. Retrieved 2008-05-09.
- ^ East Carolina University Department of Diving & Water Safety. "Seasickness: Information and Treatment".