Is Your Website Making Users Sick?

When your content triggers vertigo it depletes brain function

When we talk about web accessibility, we often treat cognitive accessibility (how easily someone can understand information) and vestibular accessibility (how someone’s physical balance system reacts to screen motion) as separate topics.

This is a mistake.

The reality is that vestibular and cognitive accessibility go hand in hand. 

When a website triggers a vestibular disorder, it doesn’t just cause physical nausea—it destroys the cognitive ability to process information.

The Medical Science of Vertigo 

When vestibular issues are triggered, the brain experiences a profound physiological crisis that depletes cognitive function.

It is not just a sensation; it is a neurological event.

Physiological Stress Response

The brain perceives the sensory mismatch (eyes seeing motion, ears feeling stillness) as a severe threat. 

This triggers an immediate release of cortisol and adrenaline—the “fight or flight” response. This hormonal surge causes:

• Rapid Heart Rate: Physical distress that makes sitting at a desk feel like hard labor.
• Muscular Tension: The body tightens to try and stabilize itself, leading to tension headaches and neck pain.

Mental Fatigue and Exhaustion

Processing the conflict between visual and vestibular input requires an immense amount of brain power. 

The brain is constantly trying to correct the perceived error.

• Executive Function Breakdown: As the brain struggles to stabilize vision, it depletes the energy required for higher-order thinking, planning, and decision-making.
• The “Brain Fog” Phenomenon: Following a vertigo episode, the brain experiences a massive drop in energy reserves, leading to inability to concentrate for hours or days after the initial trigger

Read more about the current science in International Journal of Molecular Medicine article Vestibular dysfunction leads to cognitive impairments: State of knowledge in the field and clinical perspectives

Meniere’s Disease Causes Cognitive Depletion

Meniere’s is a disorder of the inner ear that causes vertigo, tinnitus (ringing in the ears), and fluctuating hearing loss.

While the primary symptom is vertigo, the cognitive consequences are severe and multifaceted.

The Impact of Tinnitus on Concentration

Tinnitus is not just a noise; it is a constant, auditory distraction.

“Imagine a loud speaker blasting in your ear while you try to sleep. You can’t. You can’t think. It overwhelms all of your senses.” – Quotes by Tas

The brain is trying to filter out the noise. This filtering process consumes executive function resources, leading to quicker mental fatigue. 

Chronic Auditory Processing Strain

Fluctuating hearing loss forces the brain to work harder to interpret sounds, especially in the presence of tinnitus. 

This strain depletes neural resources that would otherwise be used for understanding and retaining information. 

“When I go to a website with random animations, bright neon colors and decorative fonts it triggers my vertigo within seconds.

If a site has audio with no captions, I am screwed. My auditory system is struggling to filter noise, while my vestibular system is battling the sensory conflict” – Quotes by Tas

The Exhaustion of Unpredictability

Meniere’s episodes are unpredictable. This creates a state of chronic anxiety and hyper-vigilance. 

The brain never truly relaxes, always waiting for the next dizzy spell. 

This constant state of stress depletes the brain’s baseline energy levels, making complex cognitive tasks—like understanding a website’s navigation or interpreting a data visualization—incredibly draining.

Imagine trying to read a complex technical report while sitting on a rollercoaster. 

You might be able to hold the paper, but your brain is so preoccupied with the physical motion and the need to stabilize your vision that it cannot allocate resources to understanding the text.

This is what happens for anyone with vestibular disorder when a site uses things like scroll-hijacking or layered parallax. 

Sensory Conflict Theory

When the eyes see movement that the inner ear does not feel, the brain goes into “panic mode,” trying to resolve the conflict. ]

Cognitively, this means:

• Reduced Attention Span: The brain is forced to focus on not getting sick, making it impossible to focus on content.
• Memory Impairment: Processing information requires working memory. Vertigo requires emergency processing. The emergency always wins.

Read more about Sensory Conflict Theories of Motion Sickness

The Loss of Predictability

Cognitive accessibility relies on predictability. A user needs to know that when they scroll down, the page moves down at a speed matching their hand.

When a site hijacks the scroll, it breaks the user’s mental model. The user has to expend cognitive energy just to learn how to navigate the site, leaving no energy left to understand the content itself.

Learn How to Support Users with Vestibular Disabilities 

Your Website Could Make People Sick 

You cannot have a cognitively accessible website if it makes users physically sick. 

If you are working to make your content accessible, you must include  vestibular accessibility. Otherwise, you are inherently creating a cognitive environment that is exclusionary.