Interstitial Cystitis: History and Discovery

Interstitial cystitis (IC) — now most often called bladder pain syndrome (BPS/IC) — is a chronic condition of bladder pain, pressure, urinary urgency, and frequency that occurs without any infection to explain it. Its written history reaches back nearly two centuries: a Philadelphia surgeon, Joseph Parrish, recorded a severe case he called the “tic doloureux of the bladder” in 1836; the gynecologist Alexander Skene supplied the enduring name “interstitial cystitis” in 1887; and in 1915 Guy Leroy Hunner of Johns Hopkins described the characteristic bladder-wall lesion now called the Hunner lesion (the “Hunner ulcer”), which he called an “elusive ulcer.” Yet for all that history, the cause remains poorly understood — a defective bladder lining, mast cells, autoimmunity, and nerve dysfunction are all studied but none is proven — and for generations the patients, overwhelmingly women, were too often told the problem was in their heads. This page traces that history honestly, distinguishing what is established from what is still hypothesis.

What Interstitial Cystitis Is
Joseph Parrish and the “Tic Doloureux of the Bladder” (1836)
Alexander Skene Names the Disease (1887)
Guy Hunner and the “Elusive Ulcer” (1915)
When Women Were Told It Was in Their Heads
A Cause Still Poorly Understood
Cystoscopy, Hydrodistension, and Two Faces of the Disease
Renaming: From Cystitis to a Chronic Pelvic Pain Syndrome
What the History Leaves Us
Research Papers and References
Connections

What Interstitial Cystitis Is

Interstitial cystitis is a long-term condition in which the bladder sends constant signals of pain, pressure, and urgency, often forcing a person to urinate many times a day and night, yet repeated urine cultures find no infection and standard tests come back “normal.” The word cystitis means inflammation of the bladder; the word interstitial points to the deeper tissue layers between the bladder’s surface lining and its muscle, where early physicians believed the trouble lay. Putting the two together, the name literally means “inflammation in the deeper wall of the bladder” — a description that captured what nineteenth-century doctors saw under the knife and the early cystoscope.

That name, however, has proven to be both a help and a trap. It is helpful because it is precise about where the suffering seems to originate; it is a trap because the suffix “-itis” promises a clear-cut inflammation that, in most patients, simply cannot be found. This mismatch between an authoritative-sounding name and an elusive physical sign sits at the very center of the disease’s history, and it explains why the condition has been renamed, redefined, and argued over for well over a hundred years.

Understanding the history matters for patients today, not just for the record. The long struggle to name and see this disease is the same struggle that led, for decades, to people being disbelieved — and knowing that story helps a person in pain understand that their experience is real, shared, and serious, even when a test result looks unremarkable.

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Joseph Parrish and the “Tic Doloureux of the Bladder” (1836)

The earliest clear written record of what we now call interstitial cystitis comes from Joseph Parrish, a Philadelphia surgeon, who in 1836 described patients suffering severe lower-urinary-tract misery — chronic frequency, urgency, painful urination, and pelvic pain — in the conspicuous absence of a bladder stone, the obvious culprit doctors of the day looked for first. Parrish grouped these cases under the vivid label “tic doloureux of the bladder.”

The phrase is worth unpacking, because it tells us how an intelligent physician of 1836 reasoned. Tic douloureux (literally “painful tic”) was the contemporary name for trigeminal neuralgia, a notorious facial nerve disorder that produced excruciating, seemingly causeless pain. By borrowing that term, Parrish was making a claim: that this baffling bladder pain, like the facial pain, was a disorder of the nerves rather than a visible mechanical lesion. Historical accounts note that Parrish credited the idea to his teacher, the eminent surgeon Philip Syng Physick, who had applied the same “tic doloureux” reasoning to patients with severe urinary symptoms and no discoverable cause.

Parrish’s account is remembered as the first description of the syndrome precisely because he isolated its defining feature — agonizing bladder symptoms with nothing obvious to explain them — and because his instinct that nerves were involved foreshadowed, by nearly two centuries, one of the leading modern hypotheses about the condition’s origin.

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Alexander Skene Names the Disease (1887)

About fifty years after Parrish, the term that still labels the disease was supplied by Alexander Johnston Chalmers Skene, a Scottish-born American gynecologist working in Brooklyn (and the same Skene remembered for the “Skene’s glands” of the female urethra). In 1887, Skene coined the term “interstitial cystitis.” He used it to describe what he understood as an inflammation that had attacked and destroyed the bladder’s lining, reaching into the deeper, interstitial layers of the bladder wall rather than remaining a superficial surface irritation.

Skene’s name embedded a particular theory of the disease directly into its label. To him, the suffering reflected a genuine, destructive inflammation of the deep bladder tissue — a reasonable conclusion in an era when physicians had only their eyes, their fingers, and the early instruments of the day to judge by. The choice of “interstitial” specifically signaled that the trouble was not on the surface but woven into the substance of the bladder wall.

It is one of the recurring ironies of this history that Skene’s confident, inflammation-based name has outlived the certainty behind it. Modern study has shown that in most patients a florid, classic inflammation cannot be demonstrated at all — one of the central reasons the field has spent the last several decades trying to find a better name. Yet “interstitial cystitis” endures, a 19th-century coinage still in daily use.

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Guy Hunner and the “Elusive Ulcer” (1915)

The single most famous name in this history belongs to Guy Leroy Hunner (1868–1957), an American gynecologist and surgeon at the Johns Hopkins Hospital in Baltimore. In 1915 Hunner published a landmark paper bearing the candidly descriptive title “A rare type of bladder ulcer in women; report of cases” (an earlier version having appeared the year before), and is widely credited with being the first to describe interstitial cystitis as a distinct disease entity and to draw the medical world’s sustained attention to it.

Hunner described a characteristic reddened, cracking lesion in the bladder wall — today called the Hunner lesion or, in older usage, the “Hunner ulcer.” So difficult was this lesion to find on examination that Hunner himself memorably called it the “elusive ulcer” (the title of a later, more detailed paper). The name captured a frustration that endures: even an experienced examiner can easily miss the lesion, and it may only declare itself when the bladder is stretched and inspected under the right conditions.

Hunner’s contribution was double-edged in a way that shaped the next century. On one hand, by putting a name and a visible sign to the disease, he made it real and respectable in the eyes of medicine and spurred decades of research. On the other hand, because the dramatic lesion he described turns out to be present in only a minority of patients — commonly cited at roughly 5 to 10 percent — generations of women whose bladders showed no Hunner lesion were, by the same logic, judged not to have “real” disease. The very sign that legitimized the condition also became a gate that shut many sufferers out.

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When Women Were Told It Was in Their Heads

Any honest history of interstitial cystitis has to confront an uncomfortable truth: for much of the twentieth century, the patients — who are predominantly women — were frequently dismissed. When urine cultures grew nothing, when no stone or tumor appeared, and when no Hunner lesion could be found, many physicians concluded that the problem was not in the bladder at all but in the mind. Women reporting relentless bladder pain and urgency were too often labeled as anxious, neurotic, or “psychosomatic,” their very real physical suffering reframed as an emotional disorder.

This was not a fringe failing; it was a mainstream pattern, and it had concrete consequences. Patients endured years of delay before a correct diagnosis, were shuttled between specialists, were sometimes referred for psychiatric care instead of urologic care, and were left feeling disbelieved by the very system meant to help them. The history of this condition is, in part, a history of women being told that what they felt could not be true because a test had failed to confirm it — a failure of the test, and of the listening, rather than of the patient.

We state this plainly because it is both factually documented in the medical and patient-advocacy record and important for readers in pain today. The lesson the history teaches is the opposite of the old dismissal: a normal-looking test does not mean nothing is wrong. Interstitial cystitis is a genuine physical condition, and the long, slow correction of that historical injustice — through patient advocacy, better diagnostic understanding, and the reframing of the disease as a chronic pain syndrome — is one of the more hopeful threads in this story.

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A Cause Still Poorly Understood

Despite nearly two hundred years of description and decades of laboratory work, the cause of interstitial cystitis remains genuinely unknown. This is not a gap that a single discovery is about to close; most experts now suspect that “interstitial cystitis” is not one disease at all but a final common pathway reached by several different underlying problems. What follows are the leading theories — and it is important to read each of them as an unresolved hypothesis, a line of active investigation rather than an established fact.

The most discussed idea is the defective bladder lining (GAG-layer) hypothesis. The inner surface of a healthy bladder is coated by a protective glycosaminoglycan (GAG) layer that shields the bladder wall from the harsh chemicals in urine. The theory holds that in interstitial cystitis this protective coat is damaged or “leaky,” allowing irritating substances such as potassium to seep into the deeper tissue and trigger pain and inflammation. It is a compelling and testable idea, and it underlies some treatments — but it remains a hypothesis, not a proven mechanism, and it does not fit every patient.

Several other theories run alongside it, none confirmed. The mast-cell hypothesis implicates an over-abundance of these inflammatory immune cells in the bladder wall, releasing histamine and other mediators. The autoimmune hypothesis proposes that the body’s own immune system attacks the bladder. The neurogenic hypothesis — a modern echo of Parrish’s 1836 intuition — suggests that bladder nerves become hypersensitive and amplify pain, sometimes as part of a broader pattern of central pain sensitization shared with conditions like fibromyalgia. Infection, injury, and inflammation are all studied as possible triggers. The honest summary is that these mechanisms may overlap, may differ from patient to patient, and have not been reduced to a single proven cause.

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Cystoscopy, Hydrodistension, and Two Faces of the Disease

The modern clinical picture rests on a tool that Hunner’s generation was only beginning to use: the cystoscope, a thin lighted instrument that lets a physician look directly inside the bladder. In current practice this is often combined with hydrodistension — gently filling and stretching the bladder with fluid under anesthesia — which can make subtle abnormalities visible. Under hydrodistension a Hunner lesion may be revealed, or tiny pinpoint hemorrhages called glomerulations may appear, though such findings are not by themselves specific to interstitial cystitis and the diagnosis remains substantially one of careful exclusion and clinical judgment.

What cystoscopy with hydrodistension has helped clarify is that the disease appears to wear (at least) two faces. Hunner-lesion (or “ulcerative”) IC features the classic lesion Hunner described and tends to behave as a more clearly inflammatory disorder of the bladder. Non-Hunner IC — the substantial majority of cases — shows no such lesion and often behaves more like a chronic pain and sensitization syndrome. This Hunner-versus-non-Hunner distinction is now one of the most important organizing ideas in the field, because the two groups can differ in their findings, their likely mechanisms, and the treatments that help them.

The distinction also retroactively vindicates the dismissed patients. The very absence of a Hunner lesion that once led doctors to doubt a woman’s pain is now understood not as proof that nothing is wrong, but as the signature of the more common form of the disease — a reframing that turns an old source of disbelief into a recognized clinical category.

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Renaming: From Cystitis to a Chronic Pelvic Pain Syndrome

Because the 19th-century name promises an inflammation that usually cannot be found, the late twentieth and early twenty-first centuries saw a deliberate effort to rename and reconceive the condition. The term bladder pain syndrome (BPS) came into use, frequently written together with the older label as interstitial cystitis/bladder pain syndrome (IC/BPS). The shift in wording is also a shift in thinking: away from a presumed bladder-wall inflammation and toward an emphasis on the defining symptom, chronic bladder pain.

The reframing went further still, situating the bladder within the body’s wider pain systems. In the United States the National Institute of Diabetes and Digestive and Kidney Diseases adopted the broader umbrella of urologic chronic pelvic pain syndrome (UCPPS), grouping IC/BPS together with related chronic pelvic pain conditions. This places interstitial cystitis alongside other chronic pain syndromes and helps explain why it so often travels with conditions such as fibromyalgia, chronic pelvic pain, irritable bowel syndrome, and similar disorders of pain processing.

None of this renaming is mere bureaucracy. Calling the condition a chronic pain syndrome rather than a simple bladder infection-like “-itis” changes how it is investigated, how it is treated, and — crucially — how seriously the patient is taken. It is the formal, institutional reversal of the old dismissal: a recognition, written into the names medicine uses, that this is a real and chronic disorder of pain.

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What the History Leaves Us

The history of interstitial cystitis is unusual among diseases in that its central mystery has never been solved. From Parrish’s “tic doloureux of the bladder” in 1836, to Skene’s naming of “interstitial cystitis” in 1887, to Hunner’s “elusive ulcer” in 1915, each milestone added a name or a sign without delivering a cause — and that cause remains, in 2026, genuinely open. The story is less a triumphant march toward a cure than a long, honest reckoning with the limits of what medicine can see.

Yet within that humbling continuity there is real progress. The disease is now recognized as a chronic pain syndrome rather than dismissed as a psychological complaint; the Hunner-versus-non-Hunner distinction has given structure to what once looked like a single baffling entity; cystoscopy with hydrodistension has put eyes on the bladder wall; and patient advocacy has helped force medicine to believe its patients. The competing theories — GAG-layer, mast-cell, autoimmune, neurogenic — remain unproven, but they are being tested rather than dismissed.

For anyone living with bladder pain syndrome today, the most useful lesson of this history is also the simplest. The hardest part of this disease, historically, was not the absence of a treatment but the absence of belief. That has changed. The pain is real, the condition is recognized, and the long arc from Parrish to the present is, finally, bending toward taking these patients seriously.

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Research Papers and References

The references below combine peer-reviewed historical and clinical literature on interstitial cystitis / bladder pain syndrome with curated PubMed topic-search links into the nomenclature, pathophysiology, and Hunner-lesion literature. Where a stable DOI or PMID is available it is linked directly; otherwise the link opens a PubMed topic search (National Library of Medicine). Each link opens in a new tab.

Parsons CL, Parsons JK. The historical origins of interstitial cystitis. Journal of Urology. 2004;171(1):20-22. — PMID: 14665834 (PubMed)
Meijlink JM. Interstitial cystitis and the painful bladder: a brief history of nomenclature, definitions and criteria. International Journal of Urology. 2014;21(Suppl 1):4-12. — doi:10.1111/iju.12307
Whitmore KE, Fall M, Sengiku A, Tomoe H, Logadottir Y, Kim YH. Hunner lesion versus non-Hunner lesion interstitial cystitis/bladder pain syndrome. International Journal of Urology. 2019;26(Suppl 1):26-34. — doi:10.1111/iju.13971
Hanno PM, Erickson D, Moldwin R, Faraday MM. Diagnosis and treatment of interstitial cystitis/bladder pain syndrome: AUA guideline amendment. Journal of Urology. 2015;193(5):1545-1553. — doi:10.1016/j.juro.2015.01.086
Homma Y, Akiyama Y, Tomoe H, et al. Clinical guidelines for interstitial cystitis/bladder pain syndrome. International Journal of Urology. 2020;27(7):578-589. — doi:10.1111/iju.14234
Akiyama Y, Hanno P. Phenotyping of interstitial cystitis/bladder pain syndrome. International Journal of Urology. 2019;26(Suppl 1):17-19. — doi:10.1111/iju.13969
Joseph Parrish and the “tic doloureux of the bladder” (1836) — historical origins of IC — PubMed: Parrish & the historical origins of interstitial cystitis
Guy Hunner, the “elusive ulcer,” and the Hunner lesion — PubMed: Hunner lesion / elusive ulcer in interstitial cystitis
Glycosaminoglycan (GAG) layer / bladder epithelial dysfunction hypothesis — PubMed: GAG-layer hypothesis in interstitial cystitis
Mast cells in interstitial cystitis / bladder pain syndrome — PubMed: mast cells in interstitial cystitis
Autoimmune and neurogenic mechanisms in IC/BPS — PubMed: autoimmune & neurogenic theories of IC/BPS
Cystoscopy with hydrodistension in the diagnosis of IC/BPS — PubMed: cystoscopy & hydrodistension in interstitial cystitis
IC/BPS as urologic chronic pelvic pain syndrome (UCPPS) and pain phenotyping — PubMed: IC/BPS and urologic chronic pelvic pain syndrome
Historical under-recognition and misdiagnosis of women with IC/BPS — PubMed: diagnostic delay & misdiagnosis in IC/BPS

External Authoritative Resources

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Connections

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