POTS and Car Sickness: Why Riding in a Car Makes You Dizzy

What Does the Research Say About POTS and Motion Sickness?

We found no study in the medical literature that tests whether POTS causes car sickness. The closest study we found ran the other way round: after parabolic flights, 8 of 16 healthy volunteers couldn't tolerate 30 minutes on a tilt table, compared with 2 of 16 before the flights, and those who didn't vomit showed signs and symptoms that resembled POTS (Schlegel, 2001). In our team's view, sitting still through a long drive can also add to POTS symptoms, covered in brain fog causes: why it gets worse when you stand or drive.

The research does tie motion sickness to the autonomic nervous system, the same system involved in POTS. A 2026 study opens with the line "Motion sickness is a common manifestation of autonomic dysfunction" (Cheng, 2026). An earlier review states that signals from the vestibular system, the balance organs of the inner ear, "are essential for triggering motion sickness," and that the sickness may represent "the aberrant activation of vestibuloautonomic pathways that typically subserve homeostasis" (Yates, 1998). Those pathways link balance signals to the autonomic system that keeps the body's internal settings steady.

One ENT review states that "Dizziness from POTS is related to dysautonomia rather than the vestibular system" (Zitser, 2026), though the same review notes that both vestibular and autonomic problems can cause chronic dizziness. That review covered dizziness on standing and didn't look at motion sickness. Our team reads the overlap differently. The balance system also helps adjust your blood pressure when you move and change posture (Yates, 2014), which is one reason our team tests vestibular and autonomic function together. How the 2 connect is covered in vestibular dysfunction and POTS. For a POTS patient whose symptoms an elevator set off, see dizzy in elevators.

What's the Difference Between Car Sickness and Motion Sickness?

Car sickness is one kind of motion sickness. "Motion sickness" is the general term for a group of common nausea syndromes, and seasickness, car sickness and airsickness are the familiar examples (Oman, 1990). It can occur when the senses report body position in ways that contradict each other or differ from what experience predicts (Yates, 1998), and that sensory-conflict idea remains the most accepted explanation (Ponsiglione, 2026). How that conflict plays out between the inner ear and the eyes is covered in dizzy in elevators: what your vestibular system reveals.

Drivers can have a separate problem. Motorist's disorientation syndrome is tied to a visual-vestibular conflict, "occurs in drivers," and is described as distinct from motion sickness (Dumas, 2026). If the car is the one place you feel steady and you get worse when it stops, that's a different pattern called MdDS, covered in why you feel better in the car.

What Did Our Team Find in One Patient Who Got Dizzy Riding in the Car?

Dizziness on car rides is one of the more common complaints our team sees. In the video above, our team walks through one patient's workup over 2 days, and it turned up 2 main problems. The video doesn't say whether this patient had POTS, so her case is one example of car sickness and can't show a POTS link.

The first showed up in the dark. With the patient looking straight ahead, both eyes slowly drifted upward together and then popped back down, about once every 2 seconds. That pattern is called downbeat nystagmus. Eyes in the dark should stay still. When they bounce in the background like a twitch, the brain needs more processing time to make sense of what you see. Some people handle that extra work without noticing any big errors, and in our team's experience many others develop symptoms. Our team describes a sensation of movement that comes with it, "almost like if you were on waves like on a boat."

The downbeat points our team to the flocculonodular lobe, part of the cerebellum at the back of the brain that fine-tunes these eye movements. Downbeat nystagmus is a recognized sign of cerebellar disorders, and research uses it to study how the cerebellum processes balance signals (Park J, 2026). Pinning it to the flocculonodular lobe is our team's reading. Because of that tie to cerebellar disorders, downbeat nystagmus is a finding to have checked by your doctor. For background on how the brain steers the eyes, see what part of the brain controls eye movements.

The second problem was vergence, the eye movement that lets you shift focus between near and far. Our team uses about 18 inches as the point where the effort of turning the eyes in starts to climb quickly. Closer than that, they have to turn toward each other, and that takes a coordinated effort. Some people struggle in one direction. With convergence insufficiency, pulling the eyes in is hard or jerky. With a vergence or accommodation spasm, focusing back out is hard. This patient had vergence errors both near and far.

Our team's 5 vestibular types are laid out in vestibular dysfunction: symptoms, tests and our team's 5 types. If unsteadiness bothers you more than spinning, see why you feel off balance but not dizzy.

Why Does a Car Ride Overload Eyes That Can't Shift Focus?

Whether you're driving or riding, your eyes keep shifting: far ahead toward the horizon, down to the dashboard or a phone, out to a sign, an oncoming car, trees flickering past or the sun through the window. Your brain has to fold all of that depth into one picture. When the eyes struggle to orient to near and far, the processing load can climb, in our team's view, and nausea and dizziness can start as you try to sort motion that isn't coming in clean. Reading or using a phone in the car stacks more near work on top of the moving road.

At exam After rotation

Replay

Research is consistent with an eye-teaming link, in different settings from this case. A 2026 study found that "Motion sickness susceptibility is closely associated with specific binocular functions," the skills the 2 eyes use to work as a team, and the sick-prone group had weaker near focusing and depth perception, which the authors suggested "may be attributed to the accommodation-convergence conflict" (Cheng, 2026). In virtual reality, young adults with binocular dysfunction had worse cybersickness and poorer balance than those with normal vision (Park A, 2026). On real roads, a study of 24 women found that longer vestibular time constants went with worse symptoms, especially when the car slowed down. During slowing, the measure also picked out who reached the nausea threshold better than a standard motion sickness questionnaire (Kim, 2026). None of these studies included people with POTS.

How Does Our Team Treat Dizziness From Riding in a Car?

The approach below comes from our team's clinical work and hasn't been tested in a published study we could find. Treatment started the day after the exam with whole-body rotation, turning the patient in a circle in a way matched to how her eyes were misfiring. The aim is to activate the parts of the inner ear that talk to that area of the cerebellum and strengthen it through that pathway. Our team paired it with eye-movement work aimed at near and far targets.

In this patient, a spot check showed the downbeat slowing from about once every 2 seconds to about once every 10 seconds within the first couple of hours. That's one patient's result on the first morning of care, and one case can't tell you what to expect for yourself. From there, our team expected to keep damping the downbeat and to improve her stability and balance. The video doesn't show how she did after that day.

Home exercises follow, to make the change strong and keep it stable over time. Our team compares them to brushing between dental cleanings, because the daily upkeep is what holds the result.

Medicines can also ease motion sickness on a given trip, and antihistamines and antimuscarinics are among the drug types that work for it (Yates, 1998). Ask your prescriber which one fits you, especially if you'll be driving.

Is It Safe to Drive With POTS?

We didn't find a study on driving safety in POTS. If dizziness, nausea or brain fog comes on at the wheel, pull over somewhere safe, and talk with your doctor about whether to drive while you work out the cause. Why a long drive is hard on a brain that may be short on blood flow is covered in brain fog while driving.

POTS and Car Sickness: FAQ