Motion Sickness: An explanation to travelling nausea

 

As a kid, I never felt motion sick- ever. I would go on the craziest of carnival rides and not feel dizzy one bit. Then a few years ago, I had a severe concussion and suddenly, I felt motion sick anytime I would get in a moving vehicle, train, airplane… even a moving walkway made me feel motion sick. But, why? Turns out it all has to do with the fluid from the inner ear. Check out everything about motion sickness here! What is motion sickness, the different types, symptoms, causes, and treatments? How does it affect the body? How does it affect the brain? What are some tips to prevent it or overcome it?

Motion sickness

Motion sickness

 

What is motion sickness?

Kinetosis, the official medical term for motion sickness, is a disagreement between how the body visually perceived movement and how the body’s sensory system senses movement. Essentially, a disagreement between two sensory systems, also known as vestibular systems, within the body.

Motion sickness is known for how ill, nauseous, or bad it can make someone feel and dates back all the way to Greek and Roman times… meaning it isn’t just a new thing. It can affect everyone at different levels of severity. Depending on the cause of the motion sickness, it can also be known as air sickness, sea sickness, car sickness, and simulation sickness.

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Types of motion sickness

There are three types of motion sickness:

1. Motion that is felt, but not seen. This type of motion sickness is sensed by the sensory system which is why the motion is felt. However, the visual system doesn’t detect much, if any, motion. Examples would be car sickness, air sickness, sea sickness, visual reality, and rotating devices (such as a centrifuge).  

2. Motion that is seen but not felt. This type of motion sickness happens because the visual system detects motion, which is why the motion is seen. However, the sensory system doesn’t detect much, if any, motion. It happens due to situations which are known as visually induced motion sickness (VIMS). Examples would be movies/films, visual reality, and space sickness.

3. When both systems feel motion but they don’t correspond. This type of motion sickness happens when one is in an environment where gravity is affected and simulated with centrifugal force. This is known as the Coriolis effect and it causes a sense of motion within the sensory system that doesn’t correspond to the motion that is seen by the visual system. For example, when a vehicle is on a badly maintained road for a long period of time while going slowly, the two senses (sensory and visual) don’t match up. This is because the bad road can jerk a body around which give the sense of extreme motion to the inner ear, but due to the slow speed, the eye doesn’t feel the same amount of motion.  

Symptoms of motion sickness

If you feel motion sick, you’ll know right away that something doesn’t feel right. However, some common symptoms include:

  • Nausea. Interestingly enough, “nausea” means “sea sickness” in Greek, “naus-” means “ship”.
  • Vomiting
  • Increase in saliva production
  • Loss of appetite
  • Dizziness
  • Shallow breathing
  • Fatigue
  • Breaking out in a cold sweat
  • Hot flashes
Motion sickness

Motion sickness- carsickness

Causes of motion sickness

Motion sickness is caused by a conflict between the different senses that are responsible for registering motion in the brain, the inner ear, the eyes, and the sensory nerves in the skin are all sending different signals to the brain. These different signals are what create dizziness. After a while, these signals create what we know to be motion sickness.

Some people begin to feel motion sickness while reading in a moving vehicle. This is because the eyes are focused on the non-moving, “steady” object while the inner ear senses motion. The brain becomes confused with all of the different brain signals sent and the person begins to feel dizzy.

The reason that people who often feel motion sickness while in a car don’t feel motion sick while driving is because they can anticipate what’s coming next. For example, they see the cars brake ahead of them, they know when a turn is coming up, they see the stoplight turn red, etc. Drivers have a more accurate internal estimate than passengers which makes them less reliant on their external senses. The anticipation that the driver feels replaces the sensory experience in the brain which prevents motion sickness.

How does motion sickness affect the brain?

Motion sickness is due to the body tried to get rid of neurotoxins. Essentially, the brain thinks it’s being poisoned so it tries to get rid of the toxins. This is thought to occur because humans weren’t made to be in moving vehicles. We have only recently started traveling on boats, cars, and trains. Our brains just haven’t adapted yet. Our bodies have been tied to walking for as long as we have had the motor ability to walk.

Our bodies use the motor cortex (the part of the brain that controls our conscious muscle movement) and the proprioception (the physical sense of ourselves) which help us know, for example, where our arm is behind our back without looking at it. We can sense it. Each of these parts of the brain supply signals to the rest of the brain about our movement.

Even though we may be traveling in a car at 50 miles an hour, our bodies perceive that we are stationary because technically, we are just sitting there not moving. At the same time, our brains know that we are going forward at a certain speed because of the balance sensors, little tubes of fluid, that are in the inner ear. When the liquid in these tubes splashes and sloshes around your brain gets mixed messages because the sloshing liquid indicates movement, but in reality, you’re just sitting still. The thalamus takes this information and tries to understand what is really going on. However, it usually comes to the conclusion that it’s being poisoned and often that leads to the feeling of nausea and actual vomiting. That’s simply the brain trying to rid itself and the body of the “apparent toxins”. Our motion sickness comes from our brain’s worry about being poisoned.

Motion sickness

Motion sickness

Treatments for motion sickness

There are many options for treatment and remedies for motion sickness :

  • Medication can be used, such as meclizine (Bonine) or Dramamine (dimenhydrinate), that is over the counter and is meant to reduce inner-ear sensitivity. However, these medications can only be preventative and have the tendency to cause drowsiness and dry mouth.  
  • Patches are also used. These patches are called scopolamine patches and are available by prescription. However, they can be addictive because people go overboard with them and are designed for only three-day use at a time. This study proves that it’s more effective than the placebo effect.
  • Bands, such as Psy bands, are bracelets designed to target a pressure point in the wrist that is believed to help tell the body’s senses to straighten out.  
  • Training. The U.S. Department of Defense and NASA have their employees go through intense training to prevent their fighter pilots and astronauts from getting motion sickness. While that training isn’t for the average person or the faint of heart, it is an option is the motion sickness gets in the way too often.

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  • Try cutting out migraine triggers from your diet. People who suffer from migraines often are actually more susceptible to motion sickness. If you grew out of motion sickness and now it’s back, or you have terrible migraines, try taking a look at what triggers the migraines to know how to deal with the motion sickness.
  • Ginger in pill form, chews, tea, or even ginger ale is effective in terms of anti-nausea. One study found that ginger works even better than the placebo effect.
  • Papaya isn’t the most scientific treatment, nor are there any studies on the subject, but it’s theorized that papaya is effective in taking away motion sickness. It’s thought that the enzymes from the papaya relieve morning sickness and nausea. If all else fails, might as well try it!
  • Other medications include valium (diazepam) in low doses, Phenergan (promethazine) and Zofran (ondansetron) for anti-nausea.

Why do only some people get motion sick?

Motion sickness affects everyone at different levels, and we are all capable of it,  but some people are prone to it. Why? No one knows for sure why some people are more prone to motion sickness than others, but it’s thought that some people are more sensitive and reactive to the dissonance happening between reality and the body than others. Some scientists believe that motion sickness is acquired or can be eliminated with enough practice. Others believe that it’s genetic and that it runs in the family. In fact, children born to a parent who is prone to motion sickness are five times more likely to inherit that trait, as well.

Think for example about the fact that native Chinese people have the tendency to get train sick while Chinese-Americans don’t have that tendency. This is because there is less opportunity in China for the body to become accustomed to the sensations that cause motion sickness. Also, think about the fact that ice skaters are actually less likely to feel car sick. Why? Because the ice skaters are used to, like that group of Chinese-Americans, the dissonance that happens between what the body is experiencing and what the body is used to.

Motion sickness

Motion sickness

It’s easy to feel motion sick on the metro/subway because you aren’t sure where the next turn is, when the train stops, etc. Your body can’t predict it, and your sensory and visual systems don’t line up.

According to this study published by Oxford Academic, roughly ⅓ of the overall population are highly susceptible to motion sickness. The other ⅔ can get it under extreme conditions. Women are more likely to be affected by motion sickness than men. It’s also probable that it will decrease with age. A 2013 study found that people who sway more, even when they are just sitting, are actually more likely to get body sick than those who remain rather stationary. The bad news is that this study found that if you have a healthy sensory system, you’re susceptible to motion sickness.

Tips to prevent or lessen motion sickness

  • Look out the window. Looking out the window while in a moving vehicle actually helps the brain understand that you are actually moving and that everything is okay.
  • Don’t put your head between your legs– that’s only used for low blood pressure, not dizziness.
  • Sit shotgun if you can’t be the driver. Shotgun, a.k.a. the passengers’ seat, is good because you’ll be able to not only look out the window, but be able to anticipate the twists and turns, and the starts and stops of the road.
  • Don’t reach for water. It can make you feel even more nauseous.
  • Reach for a carbonated drink. Reason being that when the stomach is upset due to nausea, the carbonation from the drink can dilute the acids and relieve the gas buildup that causes the uneasy stomach feeling.
  • Eat a light meal that is high in protein before the trip to ensure that the stomach is as calm as can be during the ride.
  • Stop the car or whatever is making you motion sick and rest a bit.
  • Find something still if stopping isn’t an option.

How do you deal with motion sickness? Let us know in the comments below!

Anna is a freelance writer who is passionate about translation, psychology, and how the world works.