Autonomic Dysfunction in Lyme Disease: POTS, Dizziness, and Why It’s Often Missed

Lyme disease may disrupt the autonomic nervous system
POTS, dizziness, tachycardia, and heat intolerance are common manifestations
Objective testing supports autonomic dysfunction in a subset of Lyme disease patients

Can Lyme disease affect the autonomic nervous system? Yes. Lyme disease may disrupt the autonomic nervous system (ANS), leading to dizziness, rapid heart rate, heat intolerance, exercise intolerance, gastrointestinal symptoms, bladder dysfunction, and postural orthostatic tachycardia syndrome (POTS).

These symptoms are frequently overlooked because routine cardiac and neurologic testing may be normal. Instead, patients are often told they have anxiety, panic attacks, chronic fatigue, or simple deconditioning despite objective evidence of autonomic dysfunction in some individuals.

Autonomic dysfunction, also called dysautonomia, has become increasingly recognized as one of the neurologic manifestations of Lyme disease.

For an overview of neurologic complications, see Neurologic Lyme Disease.

What Is the Autonomic Nervous System?

The autonomic nervous system regulates the body’s involuntary functions, including:

Heart rate
Blood pressure
Breathing
Body temperature
Sweating
Digestion
Bladder function
Pupil size

Two complementary systems maintain this balance:

The sympathetic nervous system, responsible for the “fight-or-flight” response.
The parasympathetic nervous system, responsible for “rest-and-digest” functions.

When these systems become dysregulated, patients may develop abnormalities affecting multiple organs simultaneously.

How Lyme Disease May Affect the Autonomic Nervous System

Several mechanisms have been proposed to explain autonomic dysfunction in Lyme disease. These include neuroinflammation, immune-mediated injury, small fiber neuropathy, involvement of autonomic pathways during neuroborreliosis, vascular dysregulation, and altered autonomic signaling.

The relative contribution of each mechanism likely varies among patients, and additional research is needed to better define their roles.

Rather than causing one isolated symptom, autonomic dysfunction often produces a constellation of seemingly unrelated problems affecting the cardiovascular, gastrointestinal, neurologic, urinary, and temperature-regulating systems.

Recent reviews suggest that dysautonomia may represent an underrecognized complication of Lyme disease, particularly in patients with persistent neurologic symptoms. However, investigators emphasize that prospective studies are still needed to determine its true frequency and underlying mechanisms.

Common Symptoms of Autonomic Dysfunction

Because the autonomic nervous system regulates nearly every organ system, symptoms can be widespread.

Dizziness or lightheadedness
Rapid heart rate (tachycardia)
Palpitations
POTS or orthostatic intolerance
Near-fainting or fainting
Exercise intolerance
Post-exertional symptom worsening
Brain fog
Heat intolerance
Cold intolerance
Temperature dysregulation
Abnormal sweating
Blurred vision
Fatigue
Shortness of breath or air hunger unrelated to primary lung disease
Nausea
Gastroparesis
Constipation or diarrhea
Urinary urgency or bladder dysfunction

Symptoms often fluctuate and may worsen with prolonged standing, hot weather, dehydration, illness, physical exertion, or emotional stress.

Dizziness, Tachycardia, and Orthostatic Intolerance

Dizziness is one of the most common symptoms of autonomic dysfunction.

Rather than arising from an inner ear disorder, dizziness may result from impaired regulation of blood pressure and reduced blood flow to the brain when standing.

Patients frequently describe:

Feeling lightheaded
Brain fog
Feeling as though they might faint
Weakness while standing
Difficulty standing in lines or hot environments

Some patients experience marked increases in heart rate upon standing despite having a normal electrocardiogram and normal cardiac imaging.

Importantly, not every patient meets formal diagnostic criteria for POTS. Many have clinically significant orthostatic intolerance without fulfilling strict heart rate thresholds.

Small Fiber Neuropathy May Contribute to Dysautonomia

Small fiber neuropathy affects the tiny sensory and autonomic nerve fibers responsible for regulating heart rate, blood pressure, sweating, temperature control, gastrointestinal motility, bladder function, and other involuntary body functions.

Objective evidence supporting autonomic dysfunction has emerged from studies of patients with persistent Lyme-associated symptoms. Novak and colleagues reported reduced intraepidermal nerve fiber density on skin biopsy consistent with small fiber neuropathy together with abnormal autonomic function testing. Most participants also demonstrated reduced cerebral blood flow during upright posture, findings that may help explain dizziness, orthostatic intolerance, exercise intolerance, and cognitive dysfunction in some patients.

Although the study involved a small number of patients and additional research is needed, it provides objective evidence that autonomic dysfunction in Lyme-associated illness may reflect measurable injury to small autonomic nerve fibers rather than symptoms alone.

These findings complement newer reviews proposing that autonomic dysfunction deserves greater recognition as part of the neurologic spectrum of Lyme disease.

Postural Orthostatic Tachycardia Syndrome (POTS)

Postural Orthostatic Tachycardia Syndrome (POTS) is one of the best-recognized forms of autonomic dysfunction.

POTS is characterized by an excessive increase in heart rate upon standing without a corresponding drop in blood pressure. Patients may experience dizziness, palpitations, fatigue, exercise intolerance, brain fog, blurred vision, nausea, tremulousness, and near-fainting.

Growing evidence suggests that Lyme disease may trigger or contribute to POTS in a subset of patients through autonomic nervous system dysfunction. The relationship remains under investigation, but clinicians increasingly recognize orthostatic intolerance following Lyme disease.

A published case series described two patients who developed persistent orthostatic intolerance meeting diagnostic criteria for POTS after appropriately treated Lyme disease. More recent reviews conclude that dysautonomia represents a plausible neurologic complication in some patients while emphasizing that prospective studies are still needed to determine its frequency and underlying mechanisms.

Learn more in our article on POTS and Lyme Disease.

Heat Intolerance, Temperature Dysregulation, and Sweating Problems

Heat intolerance is one of the most common manifestations of autonomic dysfunction.

Many patients notice worsening dizziness, rapid heart rate, fatigue, weakness, brain fog, or near-fainting during hot weather, hot showers, humid environments, fever, or even mild exercise.

Because the autonomic nervous system regulates body temperature and blood vessel tone, impaired autonomic control can make it difficult to dissipate heat appropriately.

Patients may also experience:

Feeling excessively hot or cold
Difficulty sweating
Excessive sweating
Poor tolerance of warm environments
Marked sensitivity to temperature changes
Chills without evidence of infection

Digestive and Bladder Symptoms

The autonomic nervous system regulates normal gastrointestinal motility and bladder function.

When autonomic regulation is impaired, patients may develop:

Nausea
Reflux
Bloating
Gastroparesis
Constipation
Diarrhea
Abdominal discomfort
Urinary urgency
Urinary frequency
Difficulty emptying the bladder

Because these symptoms often develop gradually, they may initially be evaluated as isolated gastrointestinal or urologic disorders rather than manifestations of dysautonomia.

Learn more in our article on Can Lyme Disease Cause Stomach Problems?.

Why Autonomic Dysfunction Is Often Missed

Autonomic dysfunction frequently affects multiple organ systems simultaneously. Patients may see cardiologists, neurologists, gastroenterologists, otolaryngologists, and psychiatrists before a unifying diagnosis is considered.

Routine electrocardiograms, echocardiograms, brain MRI scans, and standard laboratory testing are often normal despite significant symptoms.

Because dizziness, palpitations, fatigue, tremulousness, and shortness of breath overlap with anxiety disorders, patients are commonly misdiagnosed with panic attacks, chronic anxiety, or simple deconditioning.

Recognizing symptom patterns—including worsening with standing, heat exposure, or exertion—can help distinguish dysautonomia from primary psychiatric conditions.

How Is Autonomic Dysfunction Diagnosed?

Diagnosis begins with a careful clinical history and physical examination. Objective testing may be helpful when symptoms suggest autonomic dysfunction.

Common diagnostic tests include:

Orthostatic vital signs
Active standing test
Tilt-table testing
Autonomic reflex testing
Heart rate variability testing
Quantitative Sudomotor Axon Reflex Test (QSART)
Skin biopsy to evaluate small fiber neuropathy
Measurement of cerebral blood flow during upright posture in selected research settings

Validated symptom questionnaires such as the COMPASS-31 may also help quantify autonomic symptom burden.

Normal autonomic testing does not completely exclude autonomic dysfunction, particularly when symptoms fluctuate or are intermittent.

Can Autonomic Dysfunction Improve?

Recovery varies considerably from patient to patient.

Some individuals improve as the underlying illness is treated, while others require ongoing management of autonomic symptoms.

Treatment may include increasing fluid and salt intake when appropriate, compression garments, gradual physical reconditioning as tolerated, medications that improve orthostatic tolerance, and management of gastrointestinal, bladder, sleep, or temperature-regulation symptoms.

Successful management often requires addressing both the underlying illness and the autonomic dysfunction rather than focusing on either condition alone.

Frequently Asked Questions

Can Lyme disease cause POTS?

Yes. Lyme disease may contribute to autonomic dysfunction that resembles or meets diagnostic criteria for POTS in some patients.

Can Lyme disease cause dizziness?

Yes. Dizziness is one of the most common manifestations of autonomic dysfunction and may result from impaired regulation of blood pressure and reduced blood flow to the brain when standing.

Can Lyme disease cause tachycardia?

Yes. Some patients develop rapid heart rate, palpitations, or exaggerated increases in heart rate after standing because of autonomic nervous system dysfunction.

Can Lyme disease cause heat intolerance?

Yes. Dysautonomia may impair temperature regulation, making patients unusually sensitive to hot weather, humidity, hot showers, or exercise.

What is dysautonomia?

Dysautonomia is another name for autonomic nervous system dysfunction. It affects involuntary body functions including heart rate, blood pressure, digestion, sweating, bladder function, and temperature regulation.

Can autonomic dysfunction affect digestion?

Yes. Dysautonomia may contribute to nausea, bloating, reflux, constipation, diarrhea, and gastroparesis because the autonomic nervous system regulates gastrointestinal motility.

How is autonomic dysfunction diagnosed?

Diagnosis combines the patient’s clinical history with orthostatic vital signs and, when appropriate, tilt-table testing, autonomic reflex testing, QSART, heart rate variability testing, and skin biopsy for small fiber neuropathy.

Clinical Takeaway

Autonomic dysfunction is one of the most underrecognized neurologic manifestations of Lyme disease. Patients may develop dizziness, orthostatic intolerance, rapid heart rate, heat intolerance, gastrointestinal dysmotility, bladder dysfunction, abnormal sweating, and exercise intolerance because the autonomic nervous system is no longer regulating normal body functions effectively.

Growing evidence suggests that dysautonomia may occur in a subset of Lyme disease patients. Proposed mechanisms include neuroinflammation, immune-mediated injury, small fiber neuropathy, and dysfunction of autonomic pathways. Although additional prospective studies are needed, objective abnormalities have been demonstrated in some patients using tilt-table testing, autonomic reflex testing, skin biopsy, and other autonomic evaluations.

Studies have also identified reduced intraepidermal nerve fiber density consistent with small fiber neuropathy and abnormal cerebral blood flow during upright posture in some patients with persistent Lyme-associated symptoms. These findings provide objective support for autonomic dysfunction and may help explain dizziness, orthostatic intolerance, exercise intolerance, and cognitive symptoms in affected individuals.

Recognizing autonomic dysfunction early may shorten diagnostic delays, reduce unnecessary testing, and lead to more comprehensive evaluation and management of patients with Lyme disease.

These articles explore autonomic dysfunction, POTS, neurologic Lyme disease, and related manifestations.

References

Adler BL, Chung T, Rowe PC, Aucott JN. Dysautonomia following Lyme disease: a key component of post-treatment Lyme disease syndrome? Front Neurol. 2024;15:1344862.
Novak P, Felsenstein D, Mao C, Octavien NR, Zubcevik N. Association of small fiber neuropathy and post-treatment Lyme disease syndrome. PLoS One. 2019;14(2):e0212222. doi:10.1371/journal.pone.0212222.
Noyes AM, Kluger J. A Tale of Two Syndromes: Lyme Disease Preceding Postural Orthostatic Tachycardia Syndrome. Ann Noninvasive Electrocardiol. 2015;20(1):82-86.
Freeman R, Wieling W, Axelrod FB, et al. Consensus statement on the definition of orthostatic hypotension, neurally mediated syncope and the postural tachycardia syndrome. Auton Neurosci. 2011;161(1-2):46-48.
Vernino S, Bourne KM, Stiles LE, et al. Postural Orthostatic Tachycardia Syndrome (POTS): State of the Science and Clinical Care. Auton Neurosci. 2021;235:102828.
Novak P. Quantitative autonomic testing. J Vis Exp. 2022;(185):e63939.

Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.

Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention

Social Converations with Dr. Daniel Cameron

Autonomic Dysfunction in Lyme Disease: POTS, Dizziness, and Why It’s Missed