You stood up too fast and the room started spinning. Your heart raced for no apparent reason. You felt exhausted after a shower. You were told it was anxiety — but something felt different, more physical, more unpredictable.

For millions of people, these are not isolated incidents or signs of panic disorder. They are hallmarks of dysautonomia, a dysfunction of the autonomic nervous system — and its most common form, Postural Orthostatic Tachycardia Syndrome (POTS).

This article is a deep dive into what dysautonomia and POTS actually are, who gets them, how they are diagnosed and treated through both conventional and functional medicine lenses, and why they so often travel alongside other conditions like connective tissue disorders, gut issues, and neurodivergence.

What Is Dysautonomia?

The autonomic nervous system (ANS) controls the functions your body runs automatically — heart rate, blood pressure, digestion, temperature regulation, breathing, and more. It has two primary branches: the sympathetic (“fight or flight”) and the parasympathetic (“rest and digest”). When these two branches fall out of balance or fail to communicate properly, the result is dysautonomia.

Dysautonomia is not a single disease but an umbrella term for a range of conditions involving autonomic dysfunction. These include:

Postural Orthostatic Tachycardia Syndrome (POTS) — the most common form
Neurocardiogenic syncope (vasovagal syncope)
Multiple System Atrophy (MSA)
Pure Autonomic Failure (PAF)
Orthostatic Hypotension

What Is POTS?

Postural Orthostatic Tachycardia Syndrome (POTS) is defined by a sustained increase in heart rate of 30 beats per minute or more (40 bpm or more in adolescents) within 10 minutes of standing — without a significant drop in blood pressure — accompanied by symptoms of orthostatic intolerance.

Common Symptoms of POTS:

Many POTS symptoms occur upon standing or after prolonged upright posture, but some are present at rest as well. Common symptoms include:

Rapid or pounding heartbeat (palpitations)
Lightheadedness or dizziness
Presyncope (feeling faint) or fainting (syncope)
Extreme fatigue, especially after exertion
Brain fog and difficulty concentrating
Shortness of breath
Chest discomfort or pressure
Headaches
Nausea and gastrointestinal upset
Shaking or tremors
Temperature dysregulation — feeling too hot or too cold
Blurred vision
Anxiety (often a physiological response to autonomic instability, not a psychological primary)

These symptoms are often dismissed as anxiety, panic disorder, deconditioning, or even hypochondria — particularly in women and adolescents. This dismissal contributes to the staggering diagnostic delays many patients experience.

Who Gets POTS? The Demographics of a Missed Diagnosis

POTS affects approximately 1% of the population in developed countries, with more than 3 million cases in the United States alone. Despite this prevalence, only 28% of primary care providers have heard of the syndrome — and the average POTS patient waits 6 years and sees 7 providers before receiving a correct diagnosis.

POTS disproportionately affects:

Women of childbearing age — roughly 80% of patients are female
Adolescents and young adults, particularly White girls and young women
Post-viral patients, particularly those recovering from COVID-19
Individuals with connective tissue disorders and certain genetic vulnerabilities

The Three Subtypes of POTS:

Understanding the subtype matters for treatment, as each responds differently to interventions.

•Neuropathic POTS

Believed to result from damage to small nerve fibers that regulate vasoconstriction in the limbs and abdomen, leading to blood pooling in the lower body upon standing and triggering a compensatory tachycardia.

•Hyperadrenergic POTS

The sympathetic nervous system is in a state of chronic overdrive. Patients often have elevated norepinephrine levels when standing and may appear highly anxious — because physiologically, their bodies are in a near-constant state of alarm.

•Hypovolemic POTS

Low blood volume — whether due to reduced sodium/fluid intake, dehydration, or poor renal regulation — drives this subtype. These patients often respond dramatically to increased salt and fluid intake.

Many patients have overlapping features of more than one subtype, which is part of why POTS can be so complex to manage.

POTS and Long COVID: A Modern Epidemic Within a Pandemic

The COVID-19 pandemic brought renewed attention to POTS due to its significant overlap with post-acute sequelae of COVID-19 (PASC, or Long COVID). Post-viral POTS is not a new phenomenon — it has been documented after Epstein-Barr virus, influenza, and other infections for decades. Proposed mechanisms include autoimmune disruption, small fiber neuropathy triggered by the virus, microclotting affecting circulation, and direct damage to the autonomic nervous system.

If you or someone you know developed heart palpitations, fatigue, dizziness, or brain fog after a COVID-19 infection and these symptoms have persisted, POTS should be on the differential diagnosis.

The Conventional Medical Work-Up:

A thorough conventional evaluation for POTS typically includes:

•History and Physical Examination

Diagnosis of POTS requires a comprehensive clinical assessment, including a detailed medical history, physical examination, orthostatic vital signs, and autonomic function tests.

•Orthostatic Vital Signs

Blood pressure and heart rate are measured lying down, then again after standing for 2, 5, and 10 minutes. A sustained HR increase of 30 bpm (40 bpm in adolescents) without significant blood pressure drop is a positive finding.

•Tilt Table Test

The gold standard for POTS diagnosis. The patient is secured to a motorized table that tilts to 70 degrees while heart rate and blood pressure are continuously monitored.

•Additional Testing

Depending on clinical suspicion, workup may include:

Autonomic function testing (sweat testing, Valsalva maneuver, deep breathing tests)
24-hour urine sodium (to evaluate volume status)
Plasma catecholamines — supine and standing, especially for hyperadrenergic subtype
Complete blood count and iron studies
Thyroid function
Skin punch biopsy for small fiber neuropathy
Echocardiogram to rule out structural heart disease
Autoimmune labs, given emerging evidence of autoantibody involvement

The Autoimmune Connection

Research from the Cleveland Clinic Journal of Medicine highlights autoimmunity as an important pathophysiologic mechanism in POTS, with G protein-coupled receptor autoantibodies detected in a significant subset of patients. This is an evolving area of research that may eventually change how we classify and treat certain POTS subtypes.

Conventional Treatment Options:

•Lifestyle Modifications (First-Line)

Increased fluid intake — 2–3 liters of water daily
Increased sodium intake — 3,000–10,000 mg/day (under medical supervision)
Compression garments — waist-high stockings or abdominal binders reduce venous pooling
Elevation of the head of the bed — reduces overnight fluid shifts
Exercise rehabilitation — particularly recumbent or horizontal exercise (rowing, swimming, recumbent cycling)

•Medications

Pharmacologic treatment is tailored to subtype:

Fludrocortisone — increases blood volume by promoting sodium retention
Midodrine — a vasoconstrictor that reduces blood pooling in the lower body
Beta-blockers (low-dose) — reduce heart rate in hyperadrenergic POTS
Ivabradine — heart rate-lowering without blood pressure effects; gaining favor in POTS management
Pyridostigmine — supports autonomic nerve conduction
SSRIs/SNRIs — helpful in some patients, particularly those with hyperadrenergic features

A Functional Medicine Perspective

While conventional medicine focuses primarily on symptom management, functional and integrative medicine approaches aim to identify and address the underlying drivers of autonomic dysfunction. This is not an either/or — the most comprehensive care often integrates both.

A functional medicine evaluation might explore:

Gut health and the microbiome
Nutritional status — deficiencies in B12, magnesium, iron, vitamin D, and electrolytes
Mitochondrial function
HPA axis dysregulation — chronic stress and adrenal patterns that perpetuate sympathetic overdrive
Toxic load — environmental exposures that burden the nervous and immune systems
Nervous system regulation — somatic approaches, breathwork, and vagal toning
Dietary interventions — anti-inflammatory, low-histamine, and blood sugar-stabilizing frameworks
Mast cell stabilization — natural and pharmaceutical approaches

If you have been told that nothing more can be done, or that your symptoms are just anxiety, a functional medicine evaluation may offer a different framework — and new possibilities.

The “Trifecta”: POTS, hEDS, and MCAS

One of the most important clinical patterns emerging in this field is the frequent co-occurrence of three conditions — sometimes called “the trifecta”:

Postural Orthostatic Tachycardia Syndrome (POTS)
Hypermobile Ehlers-Danlos Syndrome (hEDS) or Hypermobility Spectrum Disorder (HSD)
Mast Cell Activation Syndrome (MCAS)

These three conditions share overlapping biological vulnerabilities and often amplify one another.

Hypermobile EDS and Connective Tissue Disorders

Hypermobile EDS (hEDS) features multisystem involvement including musculoskeletal pain, gastrointestinal dysmotility, autonomic dysfunction, and neurocognitive symptoms. In a survey of 116 patients with hypermobile EDS, nearly everyone (98%) reported orthostatic intolerance. The reason is structural: in hEDS, blood vessel walls are overly lax, preventing proper vasoconstriction when standing, which leads to blood pooling and the compensatory tachycardia that defines POTS.

Signs that suggest hEDS alongside POTS include joint hypermobility (often identified with the Beighton score), frequent sprains or subluxations, stretchy or velvety skin, chronic widespread pain, easy bruising, and a history of being “double-jointed.”

Mast Cell Activation Syndrome (MCAS)

In MCAS, mast cells are inappropriately triggered and release histamine, tryptase, prostaglandins, and other inflammatory mediators in excess. Research has documented that among patients with MCAS, the most common comorbid autonomic disorder is POTS — and many of these patients also carry a diagnosis of hypermobile EDS, completing the trifecta.

MCAS symptoms include flushing, hives, itching, gastrointestinal distress, anaphylaxis-like reactions, brain fog, and worsening POTS symptoms. Triggers include heat, exercise, certain foods, fragrances, alcohol, and stress.

Histamine Intolerance

Closely related to MCAS is histamine intolerance — an impaired ability to break down histamine, often due to reduced activity of the enzyme diamine oxidase (DAO). Research published in Nutrients found that DAO deficiency leads to defective histamine clearance, and that alterations in the gut microbiota may contribute to this enzyme deficiency. Because histamine causes vasodilation, elevated histamine can significantly worsen POTS symptoms — which is why a low-histamine diet is often recommended in patients with MCAS overlap.

The Gut-Autonomic Connection

The enteric nervous system — sometimes called the “second brain” — communicates bidirectionally with the central nervous system via the vagus nerve, and its health has direct implications for autonomic function. Gastrointestinal disorders are among the most prevalent POTS-related symptoms.

Common gut issues in POTS patients include:

Gastroparesis (delayed gastric emptying)
Irritable Bowel Syndrome (IBS)
Small Intestinal Bacterial Overgrowth (SIBO)
Functional dyspepsia
Nausea after meals (postprandial blood pooling in the gut)

Research from Vanderbilt University found distinct differences in gut microbiota composition and short-chain fatty acid profiles in POTS patients compared to healthy controls — suggesting the gut may actively contribute to autonomic dysregulation, not merely reflect it.

Eating smaller, more frequent meals, reducing carbohydrate load at any given sitting, and avoiding meals that trigger histamine release (fermented foods, aged cheeses, alcohol, leftovers) can all help manage postprandial POTS symptoms.

Neurodivergence and POTS: A Pattern Worth Recognizing

One of the more striking patterns in dysautonomia research is the frequent overlap with neurodivergence, particularly autism spectrum disorder (ASD) and ADHD. Research highlights a strong connection between neurodivergence and joint hypermobility, showing that the more hypermobile someone is, the more likely they are to experience chronic pain and dysautonomia.

For clinicians, a patient presenting with POTS — especially one with anxiety, sensory sensitivities, joint hypermobility, and GI issues — warrants consideration of ADHD or autism as part of the broader clinical picture. For patients, it can be validating to understand that these conditions often share common roots rather than being unrelated coincidences.

The Hormonal Dimension: POTS Across the Menstrual Cycle

Because POTS disproportionately affects women of reproductive age, the influence of hormones on symptom expression is clinically significant — and often overlooked.

A survey of POTS patients found that symptoms worsened prior to and during menses in 72.4% of subjects, and hormonal contraceptive therapy helped to control symptoms in approximately half of those who tried it. The mechanisms are multifactorial:

Estrogen promotes vasodilation and increases capillary permeability, contributing to blood pooling
Progesterone has mild diuretic properties, reducing circulating blood volume
Histamine surges cyclically with estrogen, worsening MCAS overlap symptoms
Menstrual blood loss reduces circulating volume, exacerbating hypovolemic features

For patients tracking their symptoms, keeping a cycle-symptom diary can reveal patterns that both validate their experience and help guide hormonal management conversations.

Perimenopause and menopause also deserve attention: erratic hormonal fluctuations can unmask or worsen previously subclinical autonomic dysfunction, and hot flashes themselves involve a dysautonomic mechanism.

The Polyvagal Perspective: Your Nervous System’s Safety Signals

The vagus nerve — the primary nerve of the parasympathetic nervous system — is a key regulator of the autonomic stress response. Polyvagal theory, developed by Dr. Stephen Porges, describes how the nervous system constantly scans the environment for safety and threat, and how chronic threat states can lock the autonomic nervous system into dysregulated patterns.

Approaches that support vagal tone and nervous system regulation — including breathwork, gentle movement, cold water exposure, humming or singing, safe social connection, and somatic therapies — can be valuable complements to medical management.

This is not to say that POTS is psychological. It is not. But the nervous system is responsive to input, and providing consistent safety signals can support the healing process in meaningful ways.

When to Seek Help

Consider evaluation for POTS or dysautonomia if you regularly experience:

Rapid heartbeat upon standing that doesn’t settle within a few minutes
Dizziness, lightheadedness, or near-fainting when upright
Extreme fatigue disproportionate to activity
Brain fog that interferes with daily function
Symptoms that worsen with heat, meals, prolonged standing, or exercise
A history of viral illness followed by the onset of these symptoms
Joint hypermobility combined with any of the above
Symptoms that have been attributed to anxiety without satisfactory improvement with anxiety treatment

You do not need to wait for a specialist. Your primary care provider can perform orthostatic vital signs in the office as a first step — it requires only a blood pressure cuff and two minutes.

Frequently Asked Questions

Q: Is POTS a serious condition? POTS is not typically life-threatening, but it can be profoundly disabling. Many patients cannot work, attend school, or perform basic daily activities at diagnosis. With appropriate treatment, most patients improve significantly.

Q: Can POTS be cured? Some patients — particularly adolescents with post-viral POTS — experience full remission. For others, it is a chronic condition that requires ongoing management. Many achieve significant improvement in quality of life with appropriate care.

Q: Is POTS the same as anxiety? No — though the two can coexist. The palpitations, dizziness, and breathlessness of POTS are physiological, driven by autonomic dysfunction, not psychological distress. Many POTS patients are misdiagnosed with anxiety for years before receiving a correct diagnosis.

Q: Can diet make a difference in POTS? Yes. Increased salt and fluid intake is a cornerstone of management. For those with MCAS overlap, a low-histamine diet can reduce symptom burden. Blood sugar stability, meal timing, and gut health all influence autonomic function.

Q: Should I exercise if I have POTS? Yes — but carefully and progressively. Deconditioning worsens POTS, so exercise is important. Start with recumbent exercise (swimming, rowing, recumbent cycling) and gradually work toward upright activity over weeks to months.

Q: Can POTS develop after COVID-19? Yes. Post-viral POTS after COVID-19 is well-documented and has been one of the most common presentations of Long COVID. If you developed autonomic symptoms after a COVID infection, ask your provider about POTS evaluation.

Q: What kind of doctor diagnoses POTS? Dysautonomia may be diagnosed by cardiologists, neurologists, or internal medicine specialists with interest in the autonomic nervous system. Primary care providers can initiate evaluation. Functional medicine physicians may also be involved in the broader workup and treatment.

A Note on Advocacy

If you suspect you or a loved one has POTS, you may need to advocate for yourself within the medical system. Bring this article. Bring a symptom diary. Ask specifically for orthostatic vital signs to be checked. If you are dismissed, seek a second opinion.

Dysautonomia International (dysautonomiainternational.org) is an excellent patient advocacy and education resource with provider directories, research updates, and community support.

You are not making this up. Your body is speaking — and it deserves to be heard.

References

Chaudhury D, et al. Clinical Presentation, Diagnostic Delays, and Treatment Outcomes in POTS. Cureus. 2025. doi:10.7759/cureus.97581

Sanchez-Perez S, et al. Intestinal Dysbiosis in Patients with Histamine Intolerance. Nutrients. 2022;14(9):1774. doi:10.3390/nu14091774

Aboseif A, et al. Autoimmunity and POTS: Implications in Diagnosis and Management. Cleveland Clinic Journal of Medicine. 2023;90(7):439–447. doi:10.3949/ccjm.90a.22093

Eccles JA, et al. Joint Hypermobility Links Neurodivergence to Dysautonomia and Pain. Frontiers in Psychiatry. 2022;12:786916. doi:10.3389/fpsyt.2021.786916

Ishimwe JA, et al. The Gut Microbiota and Short-Chain Fatty Acids Profile in POTS. Frontiers in Physiology. 2022;13:879012. doi:10.3389/fphys.2022.879012

Raj SR, et al. Menstrual Cycle Variability in Symptoms of POTS. Heart, Lung and Circulation. 2022. doi:10.1016/j.hlc.2022.05.006

Weinstock LB, et al. Mast Cell Activation Syndrome and Comorbid Autonomic Disorders. Frontiers in Neurology. 2024.