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Why Dizziness Persists After COVID-19
Vertigo, dizziness, and lightheadedness are among the most distressing — and often overlooked — symptoms of long COVID. For many patients, the world feels unsteady months or even years after their acute SARS-CoV-2 infection has resolved. Standard ENT evaluations and brain scans frequently return normal results, leaving patients frustrated and without clear answers.
At St. George Hospital (Klinik St. Georg) in Bad Aibling, Germany, we have treated hundreds of post-COVID patients with persistent vestibular and autonomic symptoms. Under the direction of Dr. Julian Douwes, our team takes a mechanistic approach — investigating the underlying causes of post-COVID dizziness rather than simply managing symptoms.
The Multiple Mechanisms Behind Post-COVID Vertigo
Post-COVID dizziness is rarely caused by a single factor. Rather, it typically results from an interplay of several mechanisms:
1. Vestibular Involvement
The vestibular system — the inner ear structures responsible for balance and spatial orientation — can be directly or indirectly affected by SARS-CoV-2:
- Viral labyrinthitis: SARS-CoV-2 may directly infect or inflame the vestibular apparatus, causing acute or persistent vertigo.
- Vestibular neuritis: Inflammation of the vestibular nerve can produce severe rotational vertigo that may take weeks to months to resolve.
- Benign paroxysmal positional vertigo (BPPV): Post-infectious BPPV — triggered by displacement of otolith crystals in the inner ear — has been reported with increased frequency after COVID-19.
- Microvascular compromise: The inner ear is supplied by tiny end arteries with no collateral circulation. Microclots obstructing these vessels can cause vestibular dysfunction without visible damage on standard imaging.
2. Autonomic Dysfunction and POTS
The autonomic nervous system — which controls heart rate, blood pressure, and blood vessel tone — is frequently disrupted in long COVID. This manifests as:
Postural Orthostatic Tachycardia Syndrome (POTS)
POTS is one of the most common autonomic disorders following COVID-19. It is characterized by:
- An excessive increase in heart rate (more than 30 beats per minute or above 120 bpm) upon standing
- Lightheadedness or presyncope when upright
- Improvement when lying down
- Palpitations, chest discomfort, and exercise intolerance
POTS-related dizziness is not true rotational vertigo but rather a sensation of lightheadedness, unsteadiness, or feeling about to faint. It can be profoundly disabling, making even basic activities like standing in line, showering, or cooking difficult (Miglis et al., 2021).
Orthostatic Hypotension
Some post-COVID patients experience drops in blood pressure upon standing, causing dizziness, visual graying, and near-fainting episodes.
3. Impaired Microcirculation
Research by Dr. Beate Jaeger and colleagues has identified microclots — abnormal fibrin amyloid clot structures — in the blood of long COVID patients. These microclots obstruct the smallest blood vessels throughout the body, including those supplying the brain and vestibular system. Impaired microcirculation to the brainstem vestibular nuclei or the inner ear can directly cause or perpetuate dizziness.
4. Neuroinflammation
Persistent inflammation in the central nervous system — including microglial activation in the brainstem — can disrupt the neural processing of balance information. Patients with neuroinflammation-driven dizziness often describe it as a constant, low-grade unsteadiness rather than discrete episodes of spinning.
5. Cervicogenic Dizziness
Prolonged illness, deconditioning, and changed posture patterns during acute COVID can lead to cervical spine dysfunction, which in turn can contribute to dizziness through disrupted proprioceptive input from the neck.
Diagnostic Approach
A thorough evaluation is essential, as the treatment depends on identifying which mechanisms are most active. Our diagnostic workup at St. George Hospital includes:
Vestibular Testing
- Video head impulse test (vHIT) for semicircular canal function
- Caloric testing for vestibular nerve function
- Dix-Hallpike and roll tests for BPPV
- Posturography for balance assessment
Autonomic Testing
- Active standing test (10-minute orthostatic vital signs)
- Tilt table testing for POTS and orthostatic hypotension
- Heart rate variability analysis
- Continuous blood pressure monitoring
Microcirculation Assessment
- Specialized coagulation studies beyond standard panels
- Dark-field microscopy
- Inflammatory and autoimmune marker panels
- Endothelial function evaluation
Neurological Evaluation
- Comprehensive neurological examination
- Brain MRI when indicated
- Neurocognitive testing (often revealing concurrent brain fog)
Our Treatment Approach
Treatment is individualized based on the diagnostic findings. Our multimodal approach typically includes:
Targeting Microclots and Microcirculation
- Therapeutic apheresis: H.E.L.P. apheresis and double filtration plasmapheresis to remove microclots, excess fibrinogen, and inflammatory mediators that impair blood flow to the vestibular system and brain.
- Anti-inflammatory infusions: Targeted protocols to reduce systemic inflammation driving microvascular damage.
Addressing Autonomic Dysfunction
- Volume expansion: Increasing blood volume through IV saline and electrolyte protocols helps counter the blood pooling that causes POTS symptoms.
- Pharmacological support: When appropriate, medications to stabilize heart rate and blood pressure (beta-blockers, midodrine, fludrocortisone).
- Compression therapy: Guidance on graduated compression garments to reduce venous pooling.
- Autonomic retraining: Structured exercise programs beginning with recumbent exercises and gradually progressing to upright activity.
Supporting Recovery
- Ozone therapy: Major autohemotherapy to improve tissue oxygenation, including to the oxygen-demanding inner ear and brainstem.
- NAD+ infusions: Supporting mitochondrial energy production in vestibular and neural tissue.
- Whole-body hyperthermia: Fever-range protocols for immune modulation and potential viral clearance.
- Vestibular rehabilitation: Specific exercises to promote central compensation for vestibular deficits.
The POTS Connection: A Deeper Look
POTS deserves special attention because it is dramatically underdiagnosed in long COVID patients. Many patients with post-COVID dizziness have never been tested for POTS despite it being one of the most common causes of their symptoms.
How COVID Triggers POTS
Several mechanisms are proposed:
- Autoimmune damage: Autoantibodies against adrenergic receptors and muscarinic receptors have been identified in post-COVID POTS patients, suggesting the immune system is attacking autonomic nerve receptors.
- Small fiber neuropathy: Damage to small nerve fibers controlling blood vessel tone leads to impaired vasoconstriction and blood pooling.
- Hypovolemia: Reduced blood volume — possibly related to impaired aldosterone production or increased vascular permeability — worsens orthostatic intolerance.
- Deconditioning: Prolonged bed rest and inactivity during acute illness leads to cardiovascular deconditioning, compounding autonomic dysfunction (Raj et al., 2021).
Screening for POTS
A simple active standing test can be performed at home or in any medical office:
- Lie down for 5–10 minutes and measure resting heart rate.
- Stand up and remain still for 10 minutes.
- Measure heart rate at 2, 5, and 10 minutes.
- A sustained increase of 30+ bpm (or heart rate above 120 bpm) with symptoms is suggestive of POTS.
What to Expect as an International Patient
Many patients with post-COVID vertigo travel to St. George Hospital from abroad. A typical treatment course includes:
- Day 1–2: Comprehensive diagnostics including vestibular, autonomic, microcirculation, and blood assessments.
- Days 3–14: Individualized treatment protocol — typically including apheresis sessions, infusion therapies, and supportive treatments.
- Ongoing: Remote follow-up with our team, coordination with home physicians, and a detailed report and treatment plan for continued care.
Frequently Asked Questions
Will my post-COVID dizziness go away on its own?
Some patients experience gradual improvement over months. However, many patients — particularly those with POTS, persistent microclots, or autoimmune mechanisms — find that symptoms plateau or persist without targeted treatment. Early intervention may improve the trajectory. Our medical team can assess your situation and advise on the likely course.
Is post-COVID vertigo dangerous?
While post-COVID dizziness is rarely life-threatening, it significantly impairs quality of life and functional capacity. It also carries fall risk, particularly in older patients. The underlying causes — particularly autonomic dysfunction and impaired microcirculation — warrant medical attention to prevent progression.
Can post-COVID POTS be cured?
Many patients with post-COVID POTS improve significantly with appropriate treatment. Some achieve full resolution, while others require ongoing management. The prognosis depends on the underlying mechanism — autoimmune-mediated POTS may respond to immunomodulatory treatment, while deconditioning-related POTS often responds to structured exercise protocols. Dr. Julian Douwes develops individualized treatment strategies based on each patient’s diagnostic profile.
What if my standard medical tests have been normal?
This is extremely common and does not mean your symptoms are not real. Standard tests (brain MRI, basic blood work, routine ENT exams) are often normal in long COVID patients with dizziness. Specialized testing — including tilt table testing for POTS, advanced coagulation studies, and microcirculation assessment — frequently reveals the underlying pathology. Our comprehensive diagnostic protocols are designed specifically to find what standard evaluations miss (Dani et al., 2021).
Contact Us
If persistent dizziness, vertigo, or lightheadedness is affecting your life after COVID-19, our specialized post-COVID team can help.
St. George Hospital (Klinik St. Georg)
Rosenheimer Str. 6–8, 83043 Bad Aibling, Germany
Phone: +49 (0)8061 398-0
Email: info@clinicum-stgeorg.de
Request a consultation — We treat patients from over 90 countries and offer multilingual support.
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