POTS (Postural Orthostatic Tachycardia Syndrome): History and Discovery

Postural orthostatic tachycardia syndrome (POTS) is a disorder of the autonomic nervous system in which simply standing up triggers an excessive, sustained jump in heart rate — at least 30 beats per minute in adults (40 in adolescents) within ten minutes of standing — together with lightheadedness, palpitations, fatigue, and brain fog, but without the fall in blood pressure that defines classic orthostatic hypotension. The cluster of symptoms is far older than the name. Nineteenth- and twentieth-century physicians described soldiers and civilians with racing, “irritable” hearts under a parade of labels — Da Costa’s syndrome, soldier’s heart, neurocirculatory asthenia, effort syndrome — long before the modern entity was precisely defined and named “postural orthostatic tachycardia syndrome” by a Mayo Clinic group, Ronald Schondorf and Phillip A. Low, in 1993. This page traces that long road from battlefield curiosity to a measurable, named autonomic disorder, and the slow, ongoing work of taking POTS — a condition that overwhelmingly affects women and was for generations dismissed — seriously.

What POTS Is, in Plain Terms
Da Costa, “Irritable Heart,” and the Civil War (1871)
Soldier’s Heart, Effort Syndrome, and Neurocirculatory Asthenia
The Mitral Valve Prolapse Detour
Schondorf and Low Name POTS (1993)
The Tilt-Table Test and the Heart-Rate Criterion
Recognizing the Subtypes
The Overlap Triad and Modern Recognition
A History of Being Dismissed
Research Papers and References
Connections

What POTS Is, in Plain Terms

Every time a healthy person stands up, gravity pulls roughly half a litre of blood downward into the legs and abdomen. The autonomic nervous system — the unconscious control system that runs heart rate, blood-vessel tone, sweating, and digestion — responds in seconds by tightening blood vessels and nudging the heart a little faster, so that blood keeps reaching the brain and blood pressure holds steady. In POTS this reflex misfires. The blood vessels do not clamp down adequately, blood pools below the waist, and the heart compensates by beating far harder and faster than it should — a rise of at least 30 beats per minute in adults, or 40 in children and adolescents, within the first ten minutes of standing. Crucially, this happens in the absence of orthostatic hypotension (a sustained drop in blood pressure), which is the feature that distinguishes POTS from older, better-known forms of fainting.

The result is a person who feels lightheaded, shaky, and palpitating the moment they are upright, who tires after the smallest exertion, and who often struggles with “brain fog” — trouble concentrating and remembering. Because none of these symptoms shows up on a resting electrocardiogram or a standard cardiac work-up, and because the heart itself is structurally normal, POTS was for a very long time invisible to the very tests doctors reached for. Understanding its history is largely the story of how medicine learned to provoke the abnormality — by standing the patient up and watching the heart rate — rather than looking for damage that was never there.

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Da Costa, “Irritable Heart,” and the Civil War (1871)

The first detailed medical portrait of a POTS-like syndrome belongs to the American physician Jacob Mendez Da Costa (1833–1900). Working at Satterlee General Hospital in Philadelphia during the United States Civil War, Da Costa studied a large series of soldiers — on the order of 300 to 400 men — who had been invalided not by wounds but by a baffling complex of cardiac complaints. They had pounding, racing hearts, breathlessness on the slightest effort, chest pain, dizziness, and exhaustion, yet on examination their hearts appeared structurally sound. In his landmark 1871 paper, “On Irritable Heart: a Clinical Study of a Form of Functional Cardiac Disorder and its Consequences,” published in the American Journal of the Medical Sciences, Da Costa gave the condition the name “irritable heart.” The soldiers themselves, and the public, came to call it “soldier’s heart,” and it was later widely known by his name as Da Costa’s syndrome.

Da Costa noticed that the racing heart was reliably triggered or worsened by being upright and by exertion, and that it often followed an acute febrile or diarrheal illness or a period of physical hardship — observations that read remarkably like a modern description of post-viral, deconditioning-associated POTS. His clinical account was so thorough that later authorities said it “has never, except in minor details, been improved upon.” It is important to be historically careful here: Da Costa did not discover POTS, and he interpreted the syndrome through the lens of his own era (he and his contemporaries often framed it as a disorder of the heart and nerves brought on by overexertion). What he did do was provide the first rigorous, named, large-series description of the symptom cluster that POTS would eventually formalize.

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Soldier’s Heart, Effort Syndrome, and Neurocirculatory Asthenia

The two World Wars filled military hospitals with men whose hearts raced and faltered on exertion but showed no structural disease, and each generation of physicians coined its own name for what was almost certainly an overlapping spectrum of orthostatic and effort intolerance. During the First World War the British cardiologist Sir Thomas Lewis studied thousands of soldiers referred with “disordered action of the heart,” and in his 1918 monograph (expanded as The Soldier’s Heart and the Effort Syndrome, 1919) he demonstrated that the great majority had no valvular or structural cardiac disease at all. Lewis popularized the term “effort syndrome,” emphasizing that symptoms were provoked by physical effort rather than by damaged heart valves.

American military physicians of the same era preferred a different label. A group of United States investigators in the First World War devised the term “neurocirculatory asthenia” — literally, a weakness of the nervous and circulatory systems — and this name was adopted by the U.S. Army and dominated the American literature through the Second World War. Across these decades the same condition accumulated a long string of synonyms: soldier’s heart, irritable heart, cardiac neurosis, functional cardiovascular disease, effort syndrome, and neurocirculatory asthenia. The recurring theme — a fast heart and exhaustion on standing or exertion, with a structurally normal heart — is precisely the territory POTS now occupies, though the older labels lumped together what we would today separate into anxiety, deconditioning, orthostatic intolerance, and true autonomic dysfunction.

It would be anachronistic to claim that every soldier diagnosed with neurocirculatory asthenia “had POTS.” These were broad, clinically-defined syndromes from an era before tilt tables and beat-to-beat monitoring, and they certainly captured a mixed population. But the historical line is genuine: the modern definition of POTS grew directly out of this century-long effort to make sense of orthostatic and exertional tachycardia in otherwise healthy people.

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The Mitral Valve Prolapse Detour

By the middle of the twentieth century, attention drifted toward the heart valves. In the 1960s and 1970s, as echocardiography matured, clinicians recognized mitral valve prolapse (MVP) — a usually benign billowing of the mitral valve leaflets — and noticed that some patients with MVP also reported palpitations, lightheadedness, fatigue, chest pain, and exercise intolerance. This constellation was packaged as the “mitral valve prolapse syndrome,” and for a time it became a popular catch-all diagnosis for young people (again, disproportionately women) with exactly the symptom profile that older physicians had called soldier’s heart.

In hindsight, much of what was attributed to the valve was really autonomic. Researchers increasingly found that the symptoms correlated poorly with the degree of valve prolapse and correlated well with signs of dysautonomia and orthostatic intolerance — in other words, many “MVP syndrome” patients were experiencing what we would now diagnose as POTS or a related autonomic disorder, with the valve finding an incidental bystander. The MVP-syndrome era is best understood as another wrong turn on the long road to a correct framework: medicine kept finding the symptoms but kept attributing them to the most readily imaged structure rather than to the harder-to-see autonomic reflex.

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Schondorf and Low Name POTS (1993)

The modern entity was defined and named in a single influential paper. In 1993, neurologists Ronald Schondorf and Phillip A. Low, working at the Mayo Clinic’s Autonomic Reflex Laboratory, published “Idiopathic postural orthostatic tachycardia syndrome: an attenuated form of acute pandysautonomia?” in the journal Neurology (1993;43(1):132–137). Reviewing a series of 16 patients — predominantly women, with acute or subacute onset of persistent lightheadedness, fatigue, and palpitations — who showed marked tachycardia on standing or head-up tilt but no orthostatic hypotension, they applied the name “postural orthostatic tachycardia syndrome” and its now-ubiquitous acronym, POTS. They framed it as a mild, often post-viral form of autonomic neuropathy — an “attenuated” partial dysautonomia — rather than a psychiatric or purely cardiac problem.

Accuracy demands a nuance here. Schondorf and Low were not the first to notice postural tachycardia without hypotension — descriptions of essentially this physiology appear earlier, including a 1982 single-patient report and the work of David H. P. Streeten through the 1980s on orthostatic tachycardia, and a 1986 report by Fouad and colleagues describing similar patients under the heading “idiopathic hypovolemia.” What the 1993 Mayo paper did, and why it is rightly credited as the naming event, was to crystallize the syndrome under the specific name “postural orthostatic tachycardia syndrome (POTS)” with a clear, reproducible heart-rate-based definition, anchoring it in a dedicated autonomic-testing laboratory. That name and that framing are what spread through neurology, cardiology, and eventually the wider public.

Phillip Low and his Mayo colleagues continued to define the field for the next quarter-century, refining the diagnostic threshold, mapping subtypes, and publishing the large case series that established POTS as a recognized clinical entity rather than a curiosity. Two decades after the naming, the field marked a “silver anniversary” of the term, a measure of how decisively the 1993 paper reset the conversation.

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The Tilt-Table Test and the Heart-Rate Criterion

The conceptual breakthrough behind POTS was diagnostic as much as it was definitional: instead of searching a resting heart for damage that was not there, clinicians learned to reproduce the abnormality by changing the patient’s posture and measuring the heart’s response. The central tool is the head-up tilt-table test, in which a patient is strapped to a motorized table and tilted from lying flat to roughly 60–70 degrees upright while heart rate and blood pressure are recorded continuously. In POTS, the heart rate climbs steeply and stays elevated while blood pressure is maintained — the signature that separates POTS from orthostatic hypotension and from ordinary fainting (vasovagal syncope).

From this emerged the heart-rate criterion that still defines the disorder: a sustained increase of ≥ 30 beats per minute (or a heart rate exceeding about 120 bpm) within ten minutes of standing or tilt, in the absence of orthostatic hypotension, accompanied by chronic symptoms of orthostatic intolerance lasting months. For children and adolescents, whose normal postural heart-rate swings are larger, the threshold was set higher, at ≥ 40 bpm. Because tilt tables are not available everywhere, an equivalent bedside “active stand” or “NASA lean” protocol — measuring heart rate and blood pressure supine and then standing at intervals — is widely used to make the same measurement with nothing more than a blood-pressure cuff and a clock.

This shift — from imaging the heart to measuring its response to gravity — is the quiet revolution at the centre of POTS’s history. It turned a century of vague, dismissable complaints into a number a clinician can write down, reproduce, and act on.

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Recognizing the Subtypes

As autonomic laboratories accumulated experience, it became clear that POTS is not one disease but a final common pathway reached by several different mechanisms, and researchers (Low and colleagues prominent among them) began sorting patients into physiological subtypes. The terminology has evolved and the categories overlap, but three are commonly described. The neuropathic form is attributed to a partial autonomic neuropathy — damage to the small nerve fibers that should constrict blood vessels in the legs and abdomen — so that blood pools and the heart races to compensate. The hyperadrenergic form is marked by an exaggerated surge of the stress hormone norepinephrine on standing, often with elevated standing catecholamine levels, surges of high blood pressure, tremor, anxiety-like symptoms, and sweating. The hypovolemic form involves an abnormally low circulating blood volume, sometimes with disturbances of the blood-volume-regulating renin–angiotensin–aldosterone system.

These categories are clinically useful because they point toward different treatments — volume expansion and compression for pooling and low volume, sympathetic-calming strategies for the hyperadrenergic pattern — but they are not rigid boxes. Many patients show features of more than one mechanism, and a given person may not fit neatly into any single subtype. The historical point is that subtyping marked the maturation of POTS from a single named syndrome into a researched disorder with proposed mechanisms, moving the field from “what shall we call it” toward “what is actually going wrong.”

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The Overlap Triad and Modern Recognition

One of the most important developments in the modern understanding of POTS has been the recognition that it rarely travels alone. Clinicians repeatedly observed that POTS clusters with two other conditions in the same patients — so often that the trio is now informally called a “triad.” The first is hypermobile Ehlers-Danlos syndrome and the broader hypermobility spectrum, a connective-tissue difference in which overly stretchy blood-vessel walls may contribute to the blood pooling that drives orthostatic tachycardia. The second is mast cell activation syndrome (MCAS), in which inappropriate release of histamine and other mediators can produce flushing, blood-pressure swings, and autonomic instability. POTS, hypermobility, and MCAS appear together far more frequently than chance would predict, although the mechanism linking them is still being worked out.

POTS also overlaps heavily with myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS), with which it shares fatigue, brain fog, and exertional intolerance, and a substantial fraction of people with long-term post-viral illness meet criteria for POTS. This overlap drew sharp public attention after 2020, when a wave of patients with post-viral autonomic dysfunction following acute infection brought POTS to far wider notice and accelerated research funding and clinical recognition. That surge of attention — arriving nearly 130 years after Da Costa and almost 30 years after the syndrome was named — finally pushed POTS toward the mainstream awareness its long history had never quite secured.

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A History of Being Dismissed

No honest history of POTS can omit how long, and how badly, patients were dismissed. POTS affects women far more than men — by most estimates the great majority of patients are female, many of them young — and its symptoms (fatigue, palpitations, dizziness, anxiety-like surges) were for generations attributed to nervousness, deconditioning, hysteria, or psychiatric illness rather than to a measurable physiological abnormality. The very names the condition carried across history — “cardiac neurosis,” “neurocirculatory asthenia” (weakness), the framing of soldier’s heart as a nervous failing — encode that bias. Because routine cardiac tests came back normal, patients were often told nothing was wrong with them.

The arrival of the tilt-table test and the 30-beats-per-minute criterion mattered precisely because they replaced a subjective complaint with an objective, reproducible measurement: a clinician could now show the abnormal heart-rate rise on a strip of paper. Yet under-recognition persisted, and studies have repeatedly found that people with POTS see many physicians and wait years — often the better part of a decade — before receiving a correct diagnosis. The story of POTS is therefore not only a scientific history of how a syndrome was measured and named, but a social one about which patients get believed, and how a number on a monitor can sometimes accomplish what a century of vivid clinical description could not. The practical management that follows from the diagnosis — salt and fluid loading, compression, exercise retraining, and targeted medication — is covered on the main POTS page and its companion deep-dive articles.

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Research Papers and References

The references below combine the key peer-reviewed and historical sources on the discovery and naming of POTS with curated PubMed topic-search links into the broader literature. Da Costa’s 1871 paper, Thomas Lewis’s monograph, and the early military descriptions are named in the article as historical primary sources. Each link opens in a new tab.

Schondorf R, Low PA. Idiopathic postural orthostatic tachycardia syndrome: an attenuated form of acute pandysautonomia? Neurology. 1993;43(1):132–137. — doi:10.1212/WNL.43.1_Part_1.132
Da Costa JM. On irritable heart: a clinical study of a form of functional cardiac disorder and its consequences (1871) — historical primary source. — PubMed: Da Costa irritable heart
Wooley CF. Where are the diseases of yesteryear? DaCosta’s syndrome, soldiers heart, the effort syndrome, neurocirculatory asthenia — and the mitral valve prolapse syndrome. Circulation. 1976;53(5):749–751. — doi:10.1161/01.CIR.53.5.749
Special Issue for the Silver Anniversary of Postural Tachycardia Syndrome (Autonomic Neuroscience, 2018) — PMC: Silver Anniversary of POTS
Fedorowski A. Postural orthostatic tachycardia syndrome: clinical presentation, aetiology and management. Journal of Internal Medicine. 2019;285(4):352–366. — doi:10.1111/joim.12852
Low PA, Sandroni P, Joyner M, Shen WK. Postural tachycardia syndrome (POTS). Journal of Cardiovascular Electrophysiology. 2009;20(3):352–358. — PubMed 19207771
Thieben MJ, Sandroni P, Sletten DM, et al. Postural orthostatic tachycardia syndrome: the Mayo Clinic experience. Mayo Clinic Proceedings. 2007;82(3):308–313. — doi:10.4065/82.3.308
Da Costa’s syndrome / soldier’s heart — historical reviews and the redefinition of functional heart disease. — PubMed: Da Costa syndrome history
Effort syndrome, neurocirculatory asthenia, and the World War military cardiology literature (Thomas Lewis and after). — PubMed: effort syndrome and neurocirculatory asthenia
Mitral valve prolapse syndrome and dysautonomia / orthostatic intolerance overlap. — PubMed: mitral valve prolapse syndrome and dysautonomia
POTS diagnostic criteria, heart-rate threshold, and the tilt-table / active-stand test. — PubMed: POTS diagnostic criteria and tilt-table testing
POTS physiological subtypes: neuropathic, hyperadrenergic, and hypovolemic forms. — PubMed: POTS subtypes
Overlap of POTS with Ehlers-Danlos / joint hypermobility and mast cell activation syndrome. — PubMed: POTS, hypermobility, and MCAS
POTS, chronic fatigue syndrome / ME-CFS, and post-viral autonomic dysfunction. — PubMed: POTS and post-viral dysautonomia

External Authoritative Resources

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Connections

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