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Nadia Ali, who suffers from severe motion sickness, poses in her Mississauga home on Friday, April 18, 2014. Ali, 26, is not able to read on the subway, bus, plane, or car, and can't sit in the backseat of a car without feeling queasy.Darren Calabrese/The Canadian Press

Rocked by the choppiness of rough waters and feeling nauseous from food, Nadia Ali was ready to abandon ship.

"I was the most miserable person on that boat," she recalled. "I wanted to jump off."

A dinner catamaran cruise in Hawaii proved turbulent for the motion-sensitive Ali. And a six-hour ferry ride from Athens to the Greek island of Mykonos left her feeling similarly queasy.

"It was so rough. ... It was not fun," recalled Ali, 26. "I popped a Gravol that time, but I know it didn't work because I was sick the entire time.

"I tried to go out to get some fresh air and just rest my head on the railing a little bit, but that wasn't too safe, so they brought me back inside, and I just had to deal.

"I just kept my head (tilted) to the right."

Reading in a moving vehicle is also a no-go for the Mississauga, Ont., resident, a freelance publicist.

"When I get on planes, the second I get on, I don't know if it's just the pressure or the air in there, I have to tilt my head and I knock out. I don't have to take any pills — nothing. And I can sometimes fall asleep before I even take off as long as my head is tilted either to the right or the left.

"If it's upright and I'm up, I get sick. I can't handle it. It is the worst. It feels like my head is going to explode and I'm going to throw up."

Travel health expert Dr. Jay Keystone said motion sickness seems to be caused by a mismatch between certain body receptors: the eyes, the vestibular mechanism in the ear, and position receptors to muscles and joints.

Keystone said the sensory conflict explains why some people experience difficulty sitting backward in moving vehicles.

"Your receptors are telling you you're moving forward; your eyes are telling you you're moving backwards. Remember, all of this is about a mismatch," said Keystone, the medical director of the Medisys Travel and Adult Immunization Clinic in Toronto.

Those who experience difficulty with reading while in motion are also experiencing sensory conflict.

Keystone said motion sickness is often more pronounced in younger children up to 10 to 15 years of age and then improves.

"It may go away in some people — it's certainly much better now with me — and I'm a senior. And I have much less problems that I had when I was younger," said Keystone, also staff physician in the tropical disease unit at Toronto General Hospital, whose identical twin brother suffers from motion sickness as well.

"It may be the sensitivity of the system," he added. "Remember, it's the visual receptors. It's the balance, the vestibular apparatus within the ear that just may be more sensitive in young children and as we get older we either acclimatize to it or accommodate to it, or the system changes."

Keystone said the reason boats and amusement park rides are likely to exacerbate motion sickness is because there's no uniform change in the environment.

"Your inner ear is thrown off because it's constantly changing. And therefore, you're getting a poor match with your visual and your inner ear."

Jennifer Hicks can remember flying to visit family in British Columbia while growing up in Toronto and her and her twin sister suffering from motion sickness.

"It was like: 'Who's going to throw up first?"' she recalled with a laugh. "My poor mum."

Hicks said if she's feeling nauseous, she finds closing her eyes and focusing on breathing helps.

"Throughout my life I've been told to look at the horizon ... That doesn't work for me. That doesn't ground or stabilize me," said the 41-year-old, who works as an artist educator with the Royal Conservatory and a speech-language pathologist.

"I actually have to close my eyes, limit any visual input at all and then just feel. In fact, if I can fall asleep that's the ideal. Just knock myself out."

Hicks is also a longtime practitioner and instructor of Nia, a body-mind-spirit program which blends movement forms and Eastern and Western traditions from martial arts, dance arts and healing arts, like yoga. She believes her involvement in Nia has helped.

"I have a twin sister who doesn't do Nia and she still experiences extreme motion sickness and I don't," said Hicks.

"I think it's that we do a lot of turning, so we're actually training our vestibular system, our sense of balance and our sense of where I am in space. I can't really explain it, but I feel like I've sort of fine-tuned."

Keystone said he wouldn't be surprised if that was the case.

"If you're improving your co-ordination, then your co-ordination is also including your joints, your muscles and your inner ear."

Keystone said there are a variety of measures individuals can take to help ease potential motion sickness symptoms. For starters, avoid consuming excessive amounts of alcohol and food.

"That increases pressure on the stomach and the abdomen and that may make you feel full. And then, if you get a change in your movement that actually makes it worse."

Keystone said sitting up front is better than riding in the backseat where individuals are more likely to experience sensory conflict. In general, he recommends selecting a seat in a vehicle where there will be the least motion.

"If you're in a car you want to be in the middle where there's the least amount of rock and roll because you know that a vehicle rolls from side to side a little bit."

The same philosophy applies to travel by water.

"If you can be in the middle — middle seat — certainly the lowest level on a ship because if a ship rocks to one side, the top of the ship moves much further than the bottom."

Drivers who roughly stop and start their vehicles while can also take a toll on travel sickness sufferers.

"That rocking motion is affecting your vestibular apparatus," said Keystone. "If you can get a driver to drive smoothly without suddenly braking and accelerating that makes a huge difference in terms of decreasing your likelihood of becoming sick."

For those opting for anti-nausea medication like Gravol, Keystone said individuals should take the dose an hour before departure. "If you wait until you're already travelling, it's going to be too late."

For those unable to ingest medication, there are Gravol suppositories that can be administered rectally.

Keyston said scopolamine — available as a tiny, transdermal patch placed behind the ear — is also effective. It can be administered anywhere from eight to 12 hours prior to travel and lasts for 72 hours — but isn't for everyone.

"There's certain things about scopolamine — especially in the elderly — that you need to think about. And it may cause a bit of blurred vision and the last thing you want is an older person to be walking along to trip and break something."

Scopolamine also can't be taken during pregnancy, he added.

Some people may opt for acupressure bands such as Sea-Bands. They are worn on each wrist and apply continuous pressure on acupressure points to help ease symptoms of nausea, upset stomach and motion sickness.

Keystone said studies on Sea-Bands are "kind of equivocal" — meaning they're not one way or the other.

"People swear by them. And from my point of view, if it works for you, use it."

Keystone said other factors that could aggravate motion sickness symptoms include poor ventilation, smoke and strong odours.