Why Do We Get Motion Sickness?

Motion sickness can sneak up on even the most seasoned travelers, whether you’re riding in a car, flying in a plane, or sailing across open water. That queasy feeling in your stomach, the cold sweat, and the urge to vomit are more than just discomfort. It’s your brain struggling to make sense of mixed signals. But why does this happen, and what exactly causes motion sickness?

The Battle Between Your Senses

Your body relies on three main systems to maintain balance and spatial awareness:

• Inner ear (vestibular system): Detects motion and orientation
• Eyes (visual input): See where you’re going
• Proprioception (muscle and joint feedback): Senses body position

When these systems agree, your brain has no trouble understanding whether you’re moving or standing still. But when they send conflicting signals, problems begin.

For example, if you’re reading a book in the backseat of a moving car, your eyes see a still page, but your inner ear senses motion. Your brain interprets this mismatch as a sign that something is wrong, possibly even poisoning. To protect you, it triggers nausea and vomiting.

Why Some People Get It Worse Than Others

Not everyone experiences motion sickness the same way. Some people are more sensitive due to:

• Genetics
• Age (children between 2 and 12 are especially prone)
• Hormonal changes, such as during pregnancy or menstruation
• Migraine history, which can increase sensitivity to motion

Interestingly, astronauts can get motion sickness in zero gravity, and even seasoned sailors may experience it until they adjust to life at sea.

Symptoms to Watch For

• Dizziness or light-headedness
• Nausea or vomiting
• Sweating
• Pale skin
• Yawning or drowsiness

Symptoms often start with a general sense of discomfort and can escalate if not addressed.

How to Prevent or Reduce Motion Sickness

There’s no universal cure, but the following strategies can help:

• Look at the horizon to align visual and motion signals
• Sit in the front seat of a car or near the wings on a plane
• Avoid reading or looking at screens while moving
• Get fresh air or use a fan
• Try medications like dimenhydrinate (Dramamine) or meclizine
• Use acupressure wristbands, which some people find helpful
• Eat lightly before travel—neither an empty nor an overly full stomach helps

The Brain’s Way of Playing It Safe

Though unpleasant, motion sickness is actually a protective response. Throughout human evolution, mixed sensory signals could have indicated poisoning, so the body reacted by trying to expel the contents of the stomach. While that logic doesn’t help much on a modern road trip, it explains why nausea is such a common reaction.