Motion Sickness (cars/travel)
What Causes Motion Sickness During Travel
Motion sickness starts when your eyes and inner ear send different messages to your brain. Your inner ear contains tiny sensors that detect movement and help you keep your balance. When you are riding in a car, your inner ear feels the motion and turns, but your eyes may be looking at something that appears still, like the seat in front of you or a book in your lap.
This mismatch between what your eyes see and what your inner ear feels confuses your brain. Your brain expects these signals to match, and when they do not, it triggers the unpleasant symptoms of motion sickness.
Looking down at a book, phone, or tablet in a moving vehicle is one of the fastest ways to trigger motion sickness. When you focus on a nearby object like a screen, your eyes tell your brain that you are sitting still. Meanwhile, your inner ear and body are feeling every bump, turn, and acceleration.
This creates an especially strong conflict between your senses. We often recommend that passengers who are prone to motion sickness keep their eyes on the horizon or distant scenery instead of reading or using devices.
When your brain cannot make sense of the conflicting signals from your eyes and inner ear, it activates your body's stress response. Scientists have proposed this reaction may have evolved as a warning system. Your brain may interpret the sensory confusion as a sign that you have eaten something toxic, which is why nausea is such a common symptom, but the exact mechanism is not fully understood.
- May involve the release of stress hormones to deal with the perceived threat
- Blood flow changes can be associated with nausea
- Your body may prepare to respond through vomiting
- Sweating and dizziness are part of this response
Different types of travel create different patterns of motion that can trigger symptoms. In cars, winding roads and frequent stops and starts are common culprits. On boats, the constant rocking and swaying affect many people, especially in rough water. Air travel can cause problems during turbulence or when your view outside is blocked.
The intensity of motion sickness often depends on how unpredictable the movement is. Smooth, steady motion in a straight line usually causes fewer problems than jerky, turning, or up-and-down movements.
Recognizing the Symptoms of Motion Sickness
Motion sickness often starts with subtle signs before the more severe symptoms appear. You might notice a vague sense of unease or discomfort in your stomach. Some people feel suddenly tired or yawn more than usual. Others experience increased saliva production or notice they are swallowing more frequently.
Recognizing these early warning signs gives you time to take action before symptoms become severe. Looking at the horizon, getting fresh air, or taking medication at this stage can often prevent worse symptoms from developing.
As motion sickness progresses, the symptoms become more obvious and uncomfortable. We see patients report a wide range of physical reactions that can make travel very unpleasant.
- Nausea or upset stomach, sometimes leading to vomiting
- Dizziness, lightheadedness, or a woozy feeling
- Cold sweats or clammy skin
- Headache or feeling pressure in your head
- Extreme fatigue or drowsiness
For most people, motion sickness symptoms begin within a few minutes to an hour of starting travel. The symptoms usually continue as long as the motion continues, though some people do adapt after several hours. Once the motion stops, symptoms typically improve within a few minutes to a few hours.
In some cases, mild symptoms like fatigue or a slight headache can linger for several hours after the trip ends. Very rarely, people experience symptoms for a day or two after prolonged exposure to motion, such as after a long sea voyage. If you feel rocking/swaying, dizziness, or nausea that continues for more than a day or two after travel, or keeps recurring without travel, seek medical evaluation.
While motion sickness is usually not dangerous, certain symptoms require medical attention. Seek urgent care if you experience severe headache with confusion, vision changes that do not go away after the motion stops, numbness or weakness on one side of your body, or difficulty speaking or walking. These symptoms could indicate a stroke or other serious neurological condition rather than simple motion sickness.
Also seek medical care if you develop any of the following during or after travel:
- Repeated vomiting with signs of dehydration (very dry mouth, minimal urination, fainting)
- New hearing loss, ringing in one ear, or ear fullness with severe vertigo
- Severe, persistent vertigo even when you are not moving
- Chest pain, fainting, or shortness of breath
- Severe headache that is sudden and maximal at onset
We also recommend an evaluation if you suddenly develop motion sickness when you never had it before, or if symptoms occur even when you are not traveling. These patterns may suggest an inner ear disorder, migraine variant, or other condition that needs treatment.
Risk Factors: Who Gets Motion Sickness Most Often
Motion sickness is most common in children between the ages of two and twelve. Infants and toddlers under two rarely get motion sickness because their sensory systems are still developing. As children enter their teen years, many find their symptoms improve or disappear completely.
However, some people continue to experience motion sickness throughout adulthood. Women are generally more susceptible than men, particularly during pregnancy or menstruation when hormonal changes can make symptoms worse.
Your hormones play a significant role in motion sickness susceptibility. Many women notice their symptoms are worse during certain times of their menstrual cycle or during pregnancy. Birth control pills and hormone replacement therapy can also affect how easily you develop motion sickness.
Genetics also matter. If your parents or siblings get motion sickness, you are more likely to experience it as well. Researchers have identified certain genetic variations that make some people more sensitive to the sensory conflicts that trigger symptoms.
Several health conditions can make you more prone to motion sickness. Inner ear problems, including infections or disorders affecting balance, increase your risk significantly. Anxiety and panic disorders can make symptoms worse or lower the threshold for triggering them.
- Inner ear infections or balance disorders
- Anxiety disorders or high stress levels
- Previous concussion or traumatic brain injury
- Visual problems that affect depth perception or eye coordination
People who get migraines are much more likely to experience motion sickness, and the two conditions appear to share some underlying mechanisms in the brain. If you have a history of migraines, you may find that motion sickness triggers a migraine headache, or that you are simply more sensitive to motion in general.
Children who get frequent motion sickness are also more likely to develop migraines later in life. We may recommend evaluation and preventive strategies if you have both conditions, as treating one can sometimes help the other.
How Motion Sickness Is Diagnosed
Most motion sickness is managed with preventive strategies and medication guidance; an eye exam is most helpful when visual strain, binocular vision issues, or atypical symptoms are suspected. When you visit us for motion sickness, we will perform a comprehensive eye examination to check for vision problems that might contribute to your symptoms. We will test how well your eyes work together, check your depth perception, and evaluate how your eyes track moving objects. Problems with eye coordination can worsen the sensory conflict that causes motion sickness.
We may also observe how your eyes move when you turn your head or change position. Abnormal eye movements can signal inner ear or brain issues that need further evaluation by a specialist.
Most cases of motion sickness do not require extensive testing, especially if your symptoms only occur during travel and fit the typical pattern. However, we may recommend additional evaluation if you have unusual symptoms, if motion sickness started suddenly in adulthood, or if you have balance problems even when not traveling.
In these cases, we might refer you to a neurologist or ear, nose, and throat specialist for balance testing, hearing evaluation, or imaging studies. These tests help rule out inner ear disorders, neurological conditions, or other problems that can mimic or worsen motion sickness.
To understand your motion sickness better, we will ask detailed questions about when and how your symptoms occur. This information helps us determine whether your symptoms are typical motion sickness or might indicate another condition.
- What types of travel trigger your symptoms and which do not
- How quickly your symptoms start and how long they last
- Whether symptoms occur at other times, such as when standing or lying down
- What medications or strategies you have already tried
- Whether you have migraines, inner ear problems, or vision issues
Treatment and Prevention Strategies
Choosing the right seat and focusing your vision appropriately can significantly reduce motion sickness. In a car, sit in the front seat if possible and look out the windshield at the road ahead or the horizon. In a plane, request a seat over the wing where motion is least noticeable, and choose a window seat so you can see outside. On a boat, stay on deck in the middle of the vessel where rocking is minimal, and keep your eyes on the stable horizon.
We recommend avoiding reading, screens, or focusing on nearby objects during travel. Instead, keep your gaze on distant, stable reference points. This helps your eyes send signals that match what your inner ear is feeling, reducing the sensory conflict that causes symptoms. Children should remain in age-appropriate car seats and seating positions; do not move a child to the front seat solely to reduce motion sickness.
Several non-prescription medications can prevent or reduce motion sickness when taken before travel begins. Antihistamines like dimenhydrinate and meclizine are most commonly used and are generally effective for mild to moderate symptoms. These medications work best when taken 30 to 60 minutes before travel starts. Always follow the product label for dosing, especially for children, older adults, and during pregnancy or breastfeeding. Consider trying a first dose at home (not on a travel day) to see how sleepy or dizzy it makes you.
The main side effect of these medications is drowsiness, which can be significant. We advise patients not to drive, operate machinery, or perform any safety-sensitive tasks after taking them. Use extra caution when combining these medicines with other substances or if you have certain medical conditions.
- Do not combine multiple antihistamines (for example, meclizine plus diphenhydramine) unless a clinician advises it
- Avoid alcohol and other sedating medicines when using motion-sickness antihistamines
- Use extra caution if you have glaucoma risk, urinary retention/BPH, constipation, or are sensitive to anticholinergic side effects (dry mouth, blurry vision)
- Older adults may have more confusion, falls, and urinary side effects
- If you are pregnant, breastfeeding, or treating a child, confirm the safest option and dose with your clinician
Ginger supplements are another option that some people find helpful, though the evidence for their effectiveness is mixed.
For people with severe motion sickness that does not respond to over-the-counter options, we may recommend prescription medications. Scopolamine patches are commonly prescribed for longer trips like cruises. You apply the patch behind your ear several hours before travel, and it releases medication gradually over three days. Wash your hands after handling the patch and avoid touching your eyes. If the medication gets into one eye, it can cause a dilated pupil and blurry vision.
We review each patient's medical history and current medications before prescribing these medicines, as they can interact with other drugs and cause side effects like dry mouth, blurred vision, or confusion, especially in older adults. Certain conditions require extra caution or may prevent use altogether.
- Avoid or use only with clinician guidance if you have narrow-angle glaucoma or are at risk for angle closure
- Use caution with urinary retention/BPH
- Older adults are more prone to confusion, hallucinations, and falls
- Drowsiness can still occur; avoid alcohol and other sedatives
Other prescription options include stronger antihistamines or medications that reduce nausea. Each option has specific benefits and side effects that we will discuss with you based on your individual situation.
Many patients prefer to try non-medication strategies first, and some approaches may help some people. Acupressure wristbands that apply pressure to a specific point on the inner wrist may help some people, though results vary. Fresh air and cool temperatures often provide relief, so opening a window or using air vents can help.
- Controlled breathing techniques to reduce anxiety and nausea
- Ginger in various forms, including tea, capsules, or candies
- Peppermint aromatherapy or peppermint tea
- Staying hydrated and avoiding heavy, greasy, or spicy foods before travel
Ginger can interact with some blood thinners and may not be appropriate for everyone; confirm safety if you are pregnant or on anticoagulants.
Some people can reduce their motion sickness over time through gradual exposure and desensitization exercises. This approach works well for sailors, pilots, and others who must travel frequently despite motion sickness. The process involves repeatedly exposing yourself to the triggering motion in short sessions, gradually increasing the duration as your tolerance builds.
Virtual reality programs and special exercises that create sensory conflicts similar to travel can also help train your brain to handle mixed signals better. These approaches can provoke symptoms; consider doing them with guidance from a vestibular therapist, and stop if symptoms are severe. We may recommend working with a vestibular therapist who specializes in balance disorders if you want to pursue this approach systematically.
If motion sickness begins while you are traveling, several strategies can help reduce symptoms. Stop reading or using screens immediately and focus on the horizon or a distant stable point. Get fresh air if possible by opening a window or going out on deck. Lying down with your eyes closed can help, or try keeping your head still against a headrest.
Sipping cold water or sucking on ice chips may ease nausea. If you are in a car and symptoms are severe, ask the driver to pull over safely so you can step outside for a few minutes. Deep, slow breathing can also help calm your nervous system and reduce symptoms.
Frequently Asked Questions
Special glasses designed for motion sickness have frames with liquid-filled rings that create an artificial horizon in your peripheral vision. Some travelers report that these glasses help reduce symptoms, though scientific evidence for their effectiveness is still limited. They work by giving your eyes additional motion cues that may better match what your inner ear is feeling. These glasses are generally safe to try, but results vary considerably from person to person.
Many children do outgrow motion sickness as their sensory systems mature and their brains become better at integrating signals from the eyes and inner ear. Most people find their symptoms improve significantly after age twelve and may disappear entirely by early adulthood. However, some people continue to experience motion sickness throughout their lives, and a few develop it for the first time as adults, particularly if they have migraines or inner ear changes.
Motion sickness and vertigo are related but different conditions. Motion sickness is triggered by actual motion and the sensory conflicts that motion creates. Vertigo is a specific type of dizziness where you feel like you or your surroundings are spinning, even when you are still. Vertigo usually indicates an inner ear or neurological problem, while motion sickness is a normal response to conflicting sensory information. However, people with vertigo disorders are often more susceptible to motion sickness as well.
Yes, many people can develop increased tolerance through repeated exposure. Professional sailors, pilots, and astronauts often experience severe motion sickness initially but adapt within a few days to weeks of continuous exposure. This adaptation involves your brain learning to reinterpret and reconcile the conflicting signals. However, tolerance can fade if you stop the regular exposure, and you may need to re-adapt the next time you travel.
Different types of motion affect people differently because they create distinct patterns of sensory conflict. Cars involve frequent starts, stops, and turns with good visibility, while planes have smoother motion but less visual connection to movement. The frequency and type of motion, along with what you can see, determine whether symptoms develop. Your individual sensory processing also plays a role, making you more sensitive to certain motion patterns than others.
Yes, several vision problems can increase your susceptibility to motion sickness. If your eyes do not work together properly, a condition called binocular vision dysfunction, your brain already struggles to integrate visual information, making the additional challenge of motion harder to handle. Uncorrected nearsightedness, farsightedness, or astigmatism can also contribute. We recommend a comprehensive eye exam to identify and correct any vision problems that might be making your motion sickness worse.
Getting Help for Motion Sickness (cars/travel)
If motion sickness interferes with your ability to travel comfortably or you have concerns about unusual symptoms, we encourage you to schedule an eye and balance evaluation. Our eye doctors can assess your vision, check for eye coordination problems, and recommend personalized strategies to help you travel more comfortably. We can also coordinate with your primary care clinician, ENT, or neurology when symptoms suggest a vestibular or neurologic cause.