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Motion sickness or seasickness is usually just a minor annoyance and does not signify any serious medical illness, but some travelers are incapacitated by it, and a few even suffer symptoms for a few days after the trip.
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Acupressure may reduce symptoms of sea sickness. Use "Sea Bands" as commercially available.
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Most medications for motion sickness need to be taken at least 30 minutes before exposure to the activity that can cause the problem.
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Motion sickness drugs, available over the counter or by prescription, can cause unpleasant and sometimes serious side effects. Many of these drugs may not be suitable for children or, in certain circumstances, even for adults.
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The standard advice for seasickness is to get up on deck where visual input agrees with vestibular input. Likewise, studies have shown that a child is far less likely to experience car sickness when in an elevated child seat that provides a good outside view.
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For motion sickness or sea sickness: Do not drink alcoholic beverages for several hours before a dive. Alcohol tends to dehydrate the body. Its other symptoms are not desirable either when diving. Alcohol can prevent the REM (Rapid Eye Movement) stage of sleep, the one in which you dream and your brain rests. You may feel tired and un alert from just a few drinks, two qualities not conducive to safe diving. If you do plan on drinking, make every third drink a glass of water. It will reduce dehydration and your chances for a hangover.
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On the Move for motion sickness can help prevent the unpleasant symptoms of travel sickness.
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To avoid motion sickness, sea sickness or altitude sickness: Aboard a ship: stay toward the middle and look at the horizon. Avoid ship travel if possible. Stay out of small tight places where you can't see the horizon.
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For motion sickness or sea sickness: While in the water, be careful not to swallow sea water. It makes many people nauseous. Make sure your mouthpiece fits well and that you have your regulator comfortably and securely in your mouth so as to keep water out.
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Approximately 90% of adults will experience motion sickness at some time in their lives. However, it is much more common for children.