Vestibular System: The Missing Link in POTS and Dysautonomia

Summary

Central argument

Dr. Spencer Zimmerman argues that the vestibular system—especially the inner ear’s otolith organs—may be an overlooked contributor to POTS and other forms of dysautonomia. He says it does more than maintain balance: it also communicates with brainstem circuits involved in heart rate, blood-vessel tone, blood flow to the brain, and leg-muscle activity.

He presents vestibular dysfunction as a possible factor that can maintain or worsen symptoms after an initial trigger, such as an infection, surgery, concussion, or whiplash. He emphasizes that this is a proposed, developing explanation—not the only cause of POTS—and that more research is needed.

POTS, dysautonomia, and overlapping conditions

Zimmerman distinguishes between a trigger for POTS and the mechanisms that may keep symptoms going. For example, an infection might precede symptoms, but ongoing illness may involve disrupted regulation rather than simply an infection that remains in the body.

He describes several factors that may contribute to symptoms:

• Reduced blood return to the heart or low blood volume
• Neuropathy and impaired sweating
• Mast-cell activation and vasodilation
• Autoimmunity, immune dysregulation, and inflammation
• Reduced blood flow and oxygen delivery to the brain
• Possible mitochondrial issues

He says POTS, ME/CFS, and prolonged COVID share features and may overlap, while still being distinct conditions. He also mentions Ehlers-Danlos syndrome and other factors that can complicate symptoms.

Zimmerman cautions that addressing one contributor—such as mast-cell problems—does not necessarily resolve POTS on its own. He favors an integrative approach.

POTS diagnostic criteria described in the video

Zimmerman describes diagnosis as involving an orthostatic challenge, such as standing from a lying position or undergoing a tilt-table test:

• For adults, a heart-rate increase of more than 30 beats per minute; for teenagers, more than 40 beats per minute
• The change is assessed over 10 minutes.
• According to his explanation, a significant blood-pressure drop in the first three minutes would instead point toward orthostatic hypotension with compensatory tachycardia.
• Symptoms must persist for at least three months, without a better explanation.

How the vestibular system may affect circulation

• The otolith organs sense gravity and changes in body position. Zimmerman says their signals reach cardiovascular centers in the brainstem.
• When someone stands, a vestibular-to-sympathetic reflex may rapidly signal blood vessels to constrict. He contrasts this with the slower baroreceptor response, citing approximate response times of 660 milliseconds for the vestibular reflex and 1.4 seconds for baroreceptors.
• He proposes that if this vestibular response is impaired, blood may pool in the legs, reducing the amount that returns to the heart and reaches the brain.
• In this model, the heart-rate increase in POTS is a compensatory response to circulation problems rather than the original cause. He therefore argues that treating tachycardia alone may manage a symptom without addressing every underlying contributor.
• He also describes a possible role for vestibular signals in activating small leg-muscle contractions that help pump blood back to the heart. Postural control, in turn, depends on the integration of vestibular, visual, and body-position (somatosensory) information.

Symptoms and related effects

Zimmerman links vestibular dysfunction not only to dizziness or balance problems, but potentially to:

• Lightheadedness, motion sensitivity, nausea, and difficulty standing
• “Brain fog,” fatigue, memory and concentration problems
• Headaches, light or noise sensitivity, and visual-motion discomfort
• Symptoms in settings such as cars or grocery stores

He stresses that someone can have vestibular dysfunction even if they feel their balance is normal. A test may reveal dysfunction even when routine examinations do not show a clear structural abnormality.

Assessments discussed

Zimmerman argues that vestibular evaluation should be considered for people with persistent POTS or dysautonomia symptoms, dizziness, or lightheadedness. Tests he mentions include:

• Oculomotor testing: Recording eye movements while following targets, tracking, and responding to visual motion
• Vestibulo-ocular reflex testing: Checking whether the eyes move appropriately when the head moves
• Positional testing: Placing a person in different positions and checking for nystagmus
• Otolith-related tests: Including subjective visual vertical and VEMP testing
• Caloric testing: Stimulating the ears with warm or cold air or water to assess vestibular responses
• Rotational-chair testing: Assessing responses to head or visual movement
• Additional measures: Evaluating proprioception and, where available, measuring brain blood flow or oxygenation with functional near-infrared spectroscopy or transcranial Doppler

He notes that some assessments may require an ENT specialist or audiologist, and that not every clinic offers all tests. He criticizes relying only on subjective impressions and favors recorded, measurable results.

Rehabilitation approach described

Zimmerman advocates an individualized program rather than applying a standard vestibular exercise routine to everyone. His proposed process is:

1. Gather objective assessment data before deciding what to train.
2. Start at a tolerable level and progress gradually. He warns that pushing through symptom exacerbation may be counterproductive for this population.
3. Monitor limits, potentially including heart rate, and account for how long a person can stand or exercise before needing rest.
4. Train vestibular function in different ways, including gaze stabilization, tracking, saccades, visual motion, walking, and movements at speeds the person can tolerate.
5. Include muscle activity and circulation-related work, rather than focusing only on head movements or balance drills.
6. Address related systems, such as vision, the cervical spine, proprioception, somatosensory function, and cognitive challenges.
7. Adapt the plan to other health factors, including neuropathy, hypermobility, anemia, vitamin deficiencies, blood-sugar or thyroid issues, hormonal factors, and gastrointestinal problems.
8. Use an integrated care team when needed, such as vestibular or vision specialists, cervical-spine clinicians, and clinicians addressing mast-cell or other systemic issues.

He says standard vestibular rehabilitation can be helpful, but may be too generic or too aggressive for some people with dysautonomia. He also notes that medication, salt, fluids, electrolytes, and compression garments can provide support, while arguing that they may not address every underlying mechanism.

Overall takeaway

The video’s main lesson is that POTS and dysautonomia may involve interacting neurological, immune, circulatory, vestibular, visual, and musculoskeletal factors. Zimmerman calls for more research and for vestibular assessment to be considered earlier, rather than assuming that normal routine findings rule out dysfunction.

His recommendations reflect the presenter’s clinical perspective; the video does not establish vestibular dysfunction as the cause of POTS for every person.

Speakers and sources featured

• Dr. Spencer Zimmerman — Presenter; identifies himself as a dual-licensed nurse practitioner and chiropractor.
• Research sources discussed but not individually named — Studies on POTS, ME/CFS, and prolonged COVID; vestibular reflexes and brain blood flow; muscle-pump and postural-control mechanisms; and astronauts’ vestibular and cardiovascular changes after spaceflight. The video also refers to a 2026 article on these conditions as neuroimmune disorders, but does not identify its authors in the subtitles.