Dysautonomia

Condition: Dysautonomia  |  Category: Neurological and Autonomic Health  |  Reviewed by: Brian Lamkin, DO

What Is Dysautonomia?

Dysautonomia is a broad term for dysfunction of the autonomic nervous system (ANS), the involuntary network that regulates heart rate, blood pressure, digestion, temperature, sweating, pupil dilation, bladder function, and the balance between the sympathetic ("fight or flight") and parasympathetic ("rest and digest") branches. When the ANS malfunctions, the body loses its ability to regulate these functions appropriately, producing symptoms that affect every organ system.

The most recognized form is POTS (Postural Orthostatic Tachycardia Syndrome), defined by a heart rate increase of 30 or more beats per minute (or above 120 bpm) upon standing without a corresponding blood pressure drop. But dysautonomia encompasses a spectrum of conditions including neurogenic orthostatic hypotension, autonomic neuropathy, inappropriate sinus tachycardia, and autonomic dysfunction secondary to Ehlers-Danlos syndrome, mast cell activation syndrome, and post-infectious immune dysregulation.

Why Dysautonomia Matters

Common Symptoms

Root Causes: A Functional Medicine Perspective

Dysautonomia has identifiable triggers and mechanisms. The label describes the dysfunction. The clinical question is what is producing it.

Autoimmune Autonomic Dysfunction

Autoimmune mechanisms produce autonomic damage through antibodies targeting ganglionic acetylcholine receptors, adrenergic receptors, or muscarinic receptors. Autoimmune activation is increasingly recognized as a mechanism in both acute-onset and chronic dysautonomia. Post-infectious autoimmune autonomic neuropathy (following viral illness including COVID-19) produces the rapid-onset POTS and autonomic dysfunction seen in many young patients.

Small Fiber Neuropathy

Autonomic small fibers (C-fibers) innervate blood vessels, sweat glands, and visceral organs. When these fibers are damaged by insulin resistance, autoimmune mechanisms, or chronic inflammation, the autonomic functions they control malfunction. Small fiber neuropathy is the most common identifiable cause of POTS in research studies and requires skin punch biopsy or QSART (quantitative sudomotor axon reflex test) for diagnosis. The causes of the small fiber neuropathy (metabolic, autoimmune, inflammatory) then become the treatment targets.

Mast Cell Activation Syndrome (MCAS)

MCAS produces autonomic symptoms through histamine and other mast cell mediators that directly affect vascular tone, heart rate, and gastrointestinal motility. The POTS-MCAS-EDS triad is one of the most common presentations in dysautonomia specialty clinics. Mast cell mediators produce vasodilation (flushing, hypotension), tachycardia, and GI dysmotility that overlap with and amplify autonomic dysfunction from other mechanisms.

Ehlers-Danlos Syndrome and Connective Tissue Laxity

Ehlers-Danlos syndrome (particularly the hypermobility type) produces autonomic dysfunction through vascular laxity that impairs venous return and baroreceptor function. The veins are too compliant, allowing excessive blood pooling in the lower extremities upon standing. The baroreceptors attempt to compensate through tachycardia, producing the POTS phenotype. This is a structural rather than neurological mechanism and requires a different treatment approach.

Conventional vs Functional Medicine Approach

Key Labs to Evaluate

How to Interpret These Labs Together

Common Patterns Seen in Patients

• The young woman diagnosed with anxiety who actually has POTS: 24-year-old with 3 years of lightheadedness, heart racing, chest tightness, and panic-like episodes. Two psychiatric medications. No autonomic testing performed. Active standing test: heart rate increase from 68 to 112 bpm upon standing. POTS confirmed. Volume expansion (2 to 3L fluid, salt loading), compression garments, and graded exercise reconditioning produced 70 percent symptom improvement. Psychiatric medications tapered. The "anxiety" was an autonomic disorder producing anxiety-mimicking symptoms.
• The post-COVID patient with new-onset exercise intolerance and tachycardia: previously active 38-year-old. Post-COVID: unable to exercise, heart rate of 130 walking up stairs, brain fog, fatigue. Autoimmune panel: positive ganglionic antibodies. Small fiber biopsy: reduced intraepidermal nerve fiber density. Post-infectious autoimmune autonomic neuropathy. Anti-inflammatory protocols, immunomodulatory support, and structured recumbent exercise reconditioning produced progressive improvement over 6 months.
• The patient with POTS, flushing, and GI symptoms on 5 medications: beta blocker, fludrocortisone, midodrine, PPI, and antihistamine. Partial improvement on each. Never evaluated for MCAS. Tryptase borderline. 24-hour urine histamine metabolites elevated. The MCAS was driving the autonomic symptoms, the flushing, and the GI dysfunction simultaneously. Comprehensive mast cell stabilization reduced symptoms across all three domains. Two medications discontinued.

Treatment and Optimization Strategy

Mechanism-Specific Dysautonomia Management

What Most Doctors Miss

• Tachycardia and lightheadedness are autonomic, not psychiatric: dysautonomia mimics anxiety at the symptom level. The distinction requires a simple active standing test measuring heart rate and blood pressure response. This test takes 10 minutes and is rarely performed before psychiatric diagnosis.
• The underlying mechanism is not investigated: once POTS or dysautonomia is diagnosed, the clinical question "why is the autonomic system malfunctioning?" is rarely asked. Autoimmune, neuropathic, MCAS, and metabolic mechanisms are identifiable and treatable.
• MCAS is a common co-driver: mast cell mediators directly produce many dysautonomia symptoms. The POTS-MCAS-EDS triad is increasingly recognized but is still under-screened in most dysautonomia evaluations.
• Exercise intolerance requires modified reconditioning, not avoidance: deconditioning worsens dysautonomia. Recumbent exercise avoids the orthostatic trigger while rebuilding the cardiovascular conditioning that improves autonomic function. Telling patients to "rest" accelerates the decline.

When to Seek Medical Care

If you experience lightheadedness or tachycardia upon standing, exercise intolerance, brain fog that worsens when upright, fainting or near-fainting episodes, or chronic fatigue with autonomic symptoms, a comprehensive autonomic evaluation including active standing test, mechanism identification (autoimmune, neuropathic, MCAS), and metabolic assessment is warranted. If you have been diagnosed with anxiety without autonomic testing, request an evaluation.

Recommended Testing

Frequently Asked Questions

How The Lamkin Clinic Approaches Dysautonomia

At The Lamkin Clinic, dysautonomia evaluation includes comprehensive autonomic testing (active standing, tilt table when indicated), mechanism identification (autoimmune panels, small fiber evaluation, mast cell mediators, metabolic assessment), and inflammatory markers. Treatment combines hemodynamic support (volume expansion, compression, reconditioning) with mechanism-specific intervention: autoimmune modulation, mast cell stabilization, small fiber neuropathy root-cause treatment, and vagal tone restoration to produce progressive functional improvement beyond what symptom management alone achieves.

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