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Health condition · Clinically reviewed

Interstitial cystitis, a treatable bladder pain syndrome, not a failed UTI.

Chronic bladder pain with frequency, urgency and nocturia - but no infection. A stepped medical approach beats years of trial-and-error antibiotics.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against ESSIC, AUA, EAU and NHS specialist commissioning standards you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including intravesical therapy, neuromodulation and MHRA guidance on pentosan polysulfate.

Key facts

IC/BPS at a glance.

The essentials, in plain English - what it is, the two patterns, and how it is managed in the UK today.

  • What it is

    A chronic pain condition of the bladder - suprapubic pain related to filling, plus urinary frequency, urgency and nocturia, without infection.

  • Also called

    Bladder pain syndrome (BPS), painful bladder syndrome - the terminology used interchangeably with interstitial cystitis (IC).

  • Who it affects

    Predominantly women, prevalence up to around 3% - though under-diagnosed, with a long delay from first symptoms to a settled label.

  • Two patterns

    Non-ulcerative disease (around 90%) and ulcerative disease with Hunner lesions (5 to 10%) - the second needs specialist urology.

  • Common overlaps

    Fibromyalgia, IBS, chronic fatigue and endometriosis - IC/BPS often travels with other chronic pain conditions.

  • Foundation therapy

    Diet, bladder training, pelvic-floor physiotherapy and stress management - built up before or alongside medication.

Why this guide matters

A stepped plan, not endless antibiotics.

IC/BPS is common, under-diagnosed and treatable - if the plan is stepped and specialist-led. The three points below shape the rest of this guide.

  • Diagnosis is a positive one

    IC/BPS is not just "recurrent UTI without a positive culture" - it is a specific pattern of bladder pain, frequency and urgency once infection has been excluded.

  • Two patterns, two pathways

    Non-ulcerative disease and ulcerative disease with Hunner lesions are managed differently - cystoscopy tells them apart.

  • Specialist care changes outcomes

    Intravesical therapy, botulinum toxin and neuromodulation offer real options for refractory disease - worth an early urology conversation.

How the diagnosis is made

From first symptoms to a clear plan.

The steps a UK GP and specialist urologist will normally follow, in order - based on the ESSIC, AUA and EAU standards.

  1. 01

    Assessing

    History and symptom diary

    Bladder pain that worsens on filling and eases on voiding, plus frequency, urgency and nocturia - captured in a bladder diary and questionnaires (O’Leary-Sant, PUF).

  2. 02

    Assessing

    Examination

    Pelvic and neurological examination, checking for pelvic-floor tenderness, prolapse and other pain generators.

  3. 03

    Assessing

    Urinalysis and culture

    A urine dip and culture to rule out infection - IC/BPS is a diagnosis made after infection and other causes have been excluded.

  4. 04

    Excluding

    Uroflowmetry and imaging

    Flow studies, post-void residual and a pelvic ultrasound (see /tests/private-ultrasound-scan/) to exclude stones, retention and pelvic pathology.

  5. 05

    Excluding

    Cytology if haematuria

    Any visible or unexplained microscopic haematuria is investigated on its own pathway before IC/BPS is confirmed.

  6. 06

    Confirming

    Cystoscopy and hydrodistension

    Specialist cystoscopy (see /treatments/cystoscopy/) with hydrodistension looks for Hunner lesions and glomerulations - biopsy taken where indicated.

  7. 07

    Confirming

    Urodynamics and MDT

    Urodynamics are selective, not routine - a specialist commissioned urology MDT plans next steps for refractory or ulcerative disease.

Typical timeline: a first GP visit to a settled specialist plan over a few months, not years.

Symptoms

What IC/BPS actually feels like.

The classic mix of bladder pain that worsens on filling, frequency, urgency, nocturia and dyspareunia - and the features that mean it is time to escalate.

  • Suprapubic bladder pain

    A dull, burning or pressure-like pain over the bladder that worsens as it fills and eases briefly on voiding.

  • Urinary frequency

    Passing small volumes many times a day - often 10 or more, sometimes far more, with little relief.

  • Urgency

    A pressing need to void driven by pain rather than a fear of leaking - different from overactive bladder urgency.

  • Nocturia

    Waking repeatedly at night to pass urine - a major driver of fatigue and low mood in IC/BPS.

  • Dyspareunia and pelvic pain

    Pain with sex and a wider pelvic pain pattern - often overlapping with endometriosis or vulvodynia.

  • Flare pattern

    Symptoms wax and wane - stress, diet, hormonal changes and long car journeys are common triggers.

  • Quality-of-life impact

    Sleep, work, mood, relationships and travel - the burden is often out of proportion to any visible finding.

  • Red flag - haematuria or new pain

    Visible blood in urine, sudden change in pattern or systemic symptoms need urgent review before an IC/BPS label is applied.

Treatment

How IC/BPS is treated in the UK.

Lifestyle and pelvic-floor physiotherapy first, oral therapy next - and intravesical care, botulinum toxin or neuromodulation for refractory disease.

  • Diet and bladder training

    Identifying and reducing trigger foods - caffeine, alcohol, citrus, tomato, spicy and acidic foods - and gently stretching voiding intervals.

  • Pelvic-floor physiotherapy

    Specialist physiotherapy for pelvic-floor overactivity and myofascial trigger points - a foundation, not an afterthought.

  • Oral amitriptyline or hydroxyzine

    Low-dose neuromodulating and antihistamine options that damp pain and urgency in many patients.

  • Pentosan polysulfate

    An oral GAG-layer therapy (Elmiron) prescribed by a specialist - the MHRA advises retinal monitoring for maculopathy risk.

  • Intravesical therapy

    Bladder instillations (see /treatments/intravesical-therapy-clinic/) with DMSO, heparin, lidocaine, hyaluronic acid or chondroitin sulfate delivered by specialist urology.

  • Hunner-lesion treatment

    Fulguration or steroid injection of Hunner lesions - a specialist urology procedure that transforms ulcerative disease.

  • Neuromodulation

    Sacral nerve stimulation (see /treatments/sacral-nerve-stimulation/) or percutaneous tibial nerve stimulation for refractory frequency and urgency.

  • Intra-detrusor botulinum toxin

    Specialist bladder injections of botulinum toxin (see /treatments/botox-medical-neurological/) for refractory urgency and pain in selected patients.

What this guide is based on

The sources behind every claim on this page.

International urology guidance and UK specialist commissioning standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or urologist knows your bladder and history and can tell you which parts apply to you. If in doubt, get seen.

  • ESSIC. Diagnostic criteria for bladder pain syndrome / interstitial cystitis.

  • American Urological Association (AUA). Diagnosis and treatment of interstitial cystitis / bladder pain syndrome.

  • European Association of Urology (EAU). Guidelines on chronic pelvic pain - bladder pain syndrome.

  • MHRA. Pentosan polysulfate (Elmiron) - risk of pigmentary maculopathy and monitoring advice.

  • NHS England. Specialised urology service specifications for refractory bladder pain syndrome.

Red flags

When bladder pain needs urgent attention.

Most IC/BPS is manageable in a stepped care plan. These are the situations that aren’t - and where urgent or specialist review is needed.

  • Visible haematuria

    Blood in urine is never assumed to be IC/BPS - it needs a separate two-week urology pathway to exclude bladder cancer.

  • Fever or systemic sepsis

    Fever, rigors or feeling systemically unwell alongside bladder symptoms points to infection, not IC/BPS - urgent review.

  • Sudden change in pattern

    A sharp change in an established pattern, or new severe pain, deserves a fresh look before labelling it a flare.

  • Urinary retention

    Being unable to pass urine, or a rapidly rising post-void residual, needs same-day urology assessment.

  • Cauda equina symptoms

    Saddle numbness, new bowel or bladder incontinence and leg weakness are neurosurgical emergencies - not IC/BPS.

  • Pregnancy and pentosan polysulfate

    Pentosan polysulfate is not routinely used in pregnancy - discuss any medication changes with a specialist early.

  • Ocular symptoms on Elmiron

    New visual changes on pentosan polysulfate need prompt retinal review under the MHRA maculopathy guidance.

  • Escalating opioid use

    Rising opioid doses without gain are a red flag - a specialist pain and urology review, not more of the same, is the answer.

  • Psychological distress

    IC/BPS carries a real mental-health burden - low mood, anxiety or suicidal thoughts need urgent primary-care or crisis support.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest difference day to day - knowing your dietary triggers, training the bladder gently, protecting sleep and mood, and asking for specialist help early.

A quiet reminder

Consistency beats intensity, every time.

Small, steady changes - kept up for months - do more than a heroic week of restriction that does not last.

  1. 01 Diet

    Learn your triggers

    Caffeine, alcohol, citrus, tomato, spicy and acidic foods are the usual suspects - a food and symptom diary teaches more than any list.

  2. 02 Routine

    Bladder training, gently

    Slowly stretching the gap between voids rebuilds capacity - guided by a specialist nurse or physiotherapist, not by pushing through pain.

  3. 03 Mind

    Stress, sleep and support

    Stress and poor sleep amplify flares - CBT, mindfulness and peer support through Bladder Health UK genuinely help.

  4. 04 Escalate

    Ask about intravesical care

    If oral therapy and lifestyle are not enough, specialist intravesical treatment and neuromodulation open real options - ask for a referral.

Frequently asked

Everything we get asked about IC/BPS.

Quick answers on diagnosis, Hunner lesions, diet, pentosan polysulfate and when to ask for referral.

  • What is interstitial cystitis?

    Interstitial cystitis, also called bladder pain syndrome (IC/BPS), is a chronic condition where bladder pain, urinary frequency, urgency and nocturia occur without infection. It is thought to involve a mix of urothelial GAG-layer dysfunction, neurogenic inflammation, mast-cell activation and central pain sensitisation, and it commonly overlaps with fibromyalgia, IBS and endometriosis.

  • How is it different from a urinary tract infection?

    A UTI is caused by bacteria and shows on urine culture, and it usually resolves with antibiotics. IC/BPS looks similar - burning, frequency, urgency - but urine cultures are repeatedly negative, and antibiotics do not help. The diagnosis is made only after infection and other causes have been carefully excluded.

  • What are Hunner lesions?

    Hunner lesions are inflamed patches on the bladder wall seen at cystoscopy in around 5 to 10% of people with IC/BPS. Their presence defines ulcerative disease and matters because these lesions respond very well to targeted treatment - fulguration or steroid injection by specialist urology - which is quite different from the pathway for non-ulcerative disease.

  • Which foods should I avoid?

    The most common triggers are caffeine, alcohol, citrus fruits, tomato-based foods, spicy foods and other acidic foods and drinks. But triggers vary between people. A structured elimination and reintroduction, ideally with a bladder and food diary, is more useful than following a generic list.

  • Is pentosan polysulfate (Elmiron) still used?

    Yes, pentosan polysulfate is still prescribed by specialists for selected patients, but the MHRA has issued guidance on a rare risk of pigmentary maculopathy affecting the retina. Anyone on the drug should have a baseline eye check, ongoing retinal monitoring and report any new visual changes promptly.

  • When should I ask for a specialist referral?

    If your symptoms persist despite lifestyle and first-line oral therapy, if cystoscopy is needed to look for Hunner lesions, or if you are considering intravesical therapy, botulinum toxin or sacral nerve stimulation, you should be under a specialist commissioned urology service. Ask your GP for referral early rather than late.

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