Bladder Pain Syndrome (Interstitial Cystitis): When Antibiotics Never Help

Last updated: August 30, 2026

• WordPress
• LinkedIn
• Mail

A large number of the women who come to my clinic with bladder pain arrive after months of going from clinic to clinic. The pattern is almost always the same: a bladder infection is suspected, antibiotics are prescribed, the course finishes, and nothing improves. Then it happens again. When that cycle keeps repeating, one condition deserves serious consideration — bladder pain syndrome, also known as interstitial cystitis.

If that describes your experience, the most useful thing to know straight away is this: the antibiotics were not failing because the dose was wrong or the bacteria were resistant. They were failing because there is no infection to treat.

Bladder pain syndrome (BPS) is a chronic painful bladder condition reported to affect at least 2.7% of women in the US. It has a long-lasting effect on quality of life and, because of the repeated consultations and treatments, a considerable financial cost too. It occurs in men as well, where it is frequently mistaken for chronic prostatitis, so the description below is not exclusively a women’s condition.

One thing to say before the medicine, because a great many patients arrive having been told it. This is not a condition you are imagining, and it is not a psychological illness. It is a real disorder of a real organ, and the reason it took so long to name is that the tests that would show it do not exist rather than that there is nothing there. If you have been made to feel otherwise along the way, that was a failure of the explanation, not of you.

How the diagnosis is made

BPS is suspected when the following criteria are met (American Urological Association):

1. An unpleasant sensation — pain, pressure or discomfort — perceived as coming from the bladder
2. Frequent urination, or an urgent need to pass urine
3. Symptoms persisting for more than 6 weeks
4. No infection or other identifiable cause

There is no single definitive test, so the diagnosis rests on the clinical picture and on excluding other conditions. That exclusion matters: anyone suspected of BPS should be investigated to make sure nothing else is hiding behind the symptoms, infection and bladder cancer in particular. Blood in the urine is not a feature of bladder pain syndrome — if it appears, it needs investigating in its own right rather than being attributed to the syndrome. Cystoscopy is optional rather than mandatory; it adds confidence if it reveals the characteristic Hunner’s lesions, but their absence does not rule BPS out, and a trial of treatment is reasonable either way.

A related point that matters once you have the label. A diagnosis of BPS is not a reason to stop taking new symptoms seriously. Anything genuinely new — blood in the urine, fever, weight loss, pain that wakes you from sleep, or a change in the character of the pain rather than its intensity — needs assessing on its own merits. The risk with any chronic diagnosis is that everything afterwards gets attributed to it, and that is worth guarding against deliberately.

And two situations need the same day rather than an appointment: fever or shaking chills with back or flank pain, or being unable to pass urine at all. Go to an emergency department — in Thailand you can call 1669. Neither is caused by bladder pain syndrome, which is exactly why they matter.

Why it happens

Several theories exist, and the honest answer is that the cause is not fully understood. Two explanations carry most of the weight:

1. The protective outer layer of the bladder lining is disrupted, letting chemicals in the urine reach the deeper layer, which is dense with nerve endings — producing pain from something the bladder would normally tolerate without complaint.
2. Repeated urinary tract infections set off inflammatory pathways in the bladder lining that persist as abnormal chronic sensation long after the infection itself has cleared.

It is also common for BPS to sit alongside other conditions in which the body’s pain signalling behaves similarly — irritable bowel syndrome, fibromyalgia, chronic fatigue, and chronic pelvic pain among them. If you recognise more than one of those in yourself, that is a useful thing to mention rather than a coincidence, because it sometimes changes which treatments are tried first.

Treatment: start gently, step up if needed

Management begins conservatively and becomes more interventional only if the response is not good enough.

1. Behavioural change and dietary adjustment — keeping track of which foods and drinks reliably worsen your symptoms is genuinely useful, because the triggers differ between individuals.
2. Pelvic floor physiotherapy
3. Stress reduction — stress does not cause BPS, but it reliably amplifies the symptoms
4. Oral medication — reported success rates of up to 77%
5. Intravesical therapy, where medication is instilled directly into the bladder — reported success rates of up to 93%
6. Sacral neuromodulation — reserved for cases that do not respond to the above, given its cost and invasiveness

Those success figures come from published series of selected patients rather than from a guarantee, and the higher ones sit at the far end of the reported range. They are a reason for optimism about the stepwise approach, not a promise about any individual.

Making the first step actually work

Dietary adjustment is the step patients most often abandon, usually because it is given as an instruction to avoid a long list of things at once. That is both miserable and unnecessary, since most people react to only a few of them. A more workable method is to cut out the usual suspects for a couple of weeks, then reintroduce them one at a time and watch what happens.

The items that most commonly provoke symptoms are coffee and tea, alcohol, carbonated drinks, citrus fruits and juices, tomatoes, spicy food, and artificial sweeteners. Your own list will be shorter than that one. Keeping a simple record for a week or two — what you drank and ate, and how the bladder was — is what turns a guess into something you can act on, and it is also the single most useful thing to bring to your appointment.

One correction worth making, because it is the commonest self-management mistake in this condition: do not cut down on fluids to reduce how often you go. It is an understandable instinct, and it makes things worse — less fluid means more concentrated urine, and more concentrated urine is more irritating to a bladder lining that is already sensitive. Drink normally, and reduce the specific things that trigger you instead.

At Bangkok Hospital Headquarters I manage bladder pain syndrome through the conservative and medical steps above, and I perform intravesical instillation therapy myself — so the full pathway from assessment through to bladder instillation is available in one place. Sacral neuromodulation is not performed at BHQ; if your case reaches that point, a referral to a centre that provides it can be arranged.

Most patients improve with treatment. What has to be said honestly is that symptoms commonly relapse, so this is a condition to be managed over time rather than cured once. Knowing that in advance changes the experience completely: a flare after months of doing well is a normal feature of the condition, not evidence that the treatment has failed or that something was missed.

Living with persistent pain takes a toll, and in a condition that took months to name and that relapses, that toll is entirely understandable rather than a sign of weakness. If the pain is affecting your sleep, your work or your mood, please say so at your appointment — it is relevant clinical information, it changes what is offered, and support for the burden of chronic pain is part of treating the condition rather than an admission that the problem is psychological.

If you have been suffering from chronic bladder pain, frequent urination, or recurrent UTI-like symptoms that don’t respond to antibiotics, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. Book a Consultation. Appointments at Samitivej Sriracha Hospital can be arranged by calling the Urology department on 088-022-1445. Questions about the cost of consultation or treatment should go to the hospital directly — for Bangkok Hospital, by email to bhquro@bdms.co.th.

Bangkok Hospital also runs a Telemedicine service, arranged in advance by email to the Urology department at bhquro@bdms.co.th. It suits this condition well for reviewing previous results, going through what has already been tried, and planning the next step — particularly for patients who have accumulated years of records at several clinics. Bring or send those records, especially any urine culture results, since a run of negative cultures alongside persistent symptoms is one of the most useful things in the file. Examination, cystoscopy and instillation therapy are done in person. Samitivej Sriracha is in-person only.

Frequently Asked Questions about Bladder Pain Syndrome

Disclaimer: This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. A diagnosis of bladder pain syndrome is made after other causes have been excluded, and new or changing symptoms should always be assessed rather than attributed to it. No medical advice, diagnosis or prescription is provided through personal messaging channels or social media. Always consult a qualified healthcare professional before starting any medical treatment. In an emergency, attend the nearest emergency department — in Thailand the emergency number is 1669.