Skip to main content

Health condition · Clinically reviewed

Cystitis, short antibiotic courses, real prevention - and when it is more than a UTI.

Most cystitis in women settles with a three-day course. The important skill is knowing the episodes that need more - a longer course, a scan, or a specialist plan.

Jump to treatment
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

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 NICE NG109, NG112, NG12 and specialist urology guidance you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK guidance including short-course antibiotics, methenamine hippurate and bladder pain syndrome pathways.

Key facts

Cystitis at a glance.

The essentials, in plain English - what it is, who it affects and how it is treated in the UK today.

  • What it is

    Inflammation of the bladder, most commonly a bacterial urinary tract infection - though non-infectious causes exist.

  • How common

    Around half of women get cystitis at some point in life. One in three women has an episode by age 24.

  • Men and cystitis

    Rare in men and always considered complicated - it needs a longer course and urology review.

  • Main organism

    Escherichia coli causes roughly 80% of uncomplicated cystitis. Klebsiella, Proteus and Staph saprophyticus follow.

  • First-line treatment

    Nitrofurantoin or trimethoprim for three days in otherwise well women, per NICE NG109.

  • When it is different

    Recurrent, complicated or interstitial cystitis needs a different pathway - not just repeat antibiotics.

Why this guide matters

Not every UTI is the same.

Uncomplicated, complicated, recurrent, interstitial - the label changes what treatment actually looks like. The three points below shape everything else on this page.

  • Short courses beat long ones

    Three days of the right antibiotic clears uncomplicated cystitis in women as well as longer courses - and drives less resistance.

  • Recurrent UTI deserves a plan

    Two episodes in six months or three in twelve means it is time for prevention, not just repeat scripts.

  • Bladder pain is not always UTI

    Chronic pelvic pain with urinary symptoms and negative cultures is interstitial cystitis or bladder pain syndrome - a specialist pathway.

How the diagnosis is made

From first symptoms to a clear plan.

The steps a UK GP, urologist or urogynaecologist will normally follow - so you know what to expect and why.

  1. 01

    Assessing

    History and red flag screen

    Fever, loin pain, male sex, pregnancy, immunocompromise, catheter and recurrent episodes all change what needs to happen next.

  2. 02

    Assessing

    Urine dipstick

    A bedside dip for nitrites, leucocytes and blood - useful in non-pregnant women under 65 but not the whole answer.

  3. 03

    Assessing

    MSU culture and sensitivities

    Essential in complicated cases, recurrent infection, men, pregnancy and any treatment failure - the culture guides the right antibiotic.

  4. 04

    Confirming

    Bloods if systemically unwell

    U and Es, FBC and CRP if there are systemic features. Blood cultures if pyelonephritis or sepsis is suspected.

  5. 05

    Confirming

    Imaging when indicated

    Ultrasound or CT KUB for pyelonephritis, male UTI, recurrent infection or suspected structural cause.

  6. 06

    Confirming

    Cystoscopy and upper tract review

    For visible haematuria, recurrent UTI, male UTI or suspicious features - bladder cancer 2WW criteria per NICE NG12 apply.

  7. 07

    Specialist

    Urodynamics and specialist review

    For interstitial cystitis, bladder pain syndrome or persistent symptoms - urogynaecology or urology-led.

Typical timeline: a first visit to a settled plan in days, not weeks, for uncomplicated cystitis.

Symptoms

What cystitis actually feels like.

The classic bladder symptoms - and the features that turn a nuisance UTI into something that needs urgent care.

  • Dysuria

    A stinging or burning pain when passing urine - the classic hallmark of cystitis.

  • Frequency and urgency

    Needing to pass small volumes often, with a sudden need to go - and nocturia at night.

  • Suprapubic pain

    A low, dragging ache above the pubic bone that often eases after voiding.

  • Cloudy or foul urine

    Turbid, strong-smelling or discoloured urine - sometimes with visible blood.

  • Haematuria

    Visible or dipstick blood in the urine - persistent or unexplained blood needs a 2WW referral.

  • Systemic features

    Fever, rigors and loin pain suggest the infection has reached the kidneys - that is pyelonephritis.

  • Confusion in older people

    New confusion, falls or a sudden decline in an older adult can be the only sign of a UTI.

  • Red flag - sepsis

    High fever, rigors, tachycardia, low blood pressure or confusion is urosepsis until proven otherwise. Call 999 or go to A and E.

Treatment

How cystitis is treated in the UK.

Short antibiotic courses for uncomplicated cases, culture-guided longer treatment when complicated, and structured prevention for recurrent or chronic disease.

  • Nitrofurantoin - three days

    First-line for uncomplicated cystitis in non-pregnant women. 100 mg modified release twice a day.

  • Trimethoprim - three days

    An alternative first-line where local resistance is low. 200 mg twice a day.

  • Longer courses for men

    Seven days of nitrofurantoin or trimethoprim, culture-guided, with a urology review and prostatitis check.

  • Pregnancy-safe options

    Nitrofurantoin (avoid third trimester), cefalexin or amoxicillin - always culture-guided with obstetric input.

  • IV antibiotics for pyelonephritis

    Co-amoxiclav, ciprofloxacin or gentamicin depending on severity and local guidance - often inpatient.

  • Vaginal oestrogen

    For post-menopausal women with recurrent UTI - well-evidenced and often overlooked.

  • Methenamine hippurate (Hiprex)

    A non-antibiotic prophylactic option now supported for recurrent UTI - a good alternative to long antibiotics.

  • Specialist bladder pain pathway

    Interstitial cystitis and bladder pain syndrome need a urogynaecology-led plan - diet, physio, instillations and neuromodulation.

Recurrent UTI - the full toolkit

Not just repeat antibiotics.

Lifestyle measures come first - steady hydration, wiping front to back, post-coital voiding, avoiding spermicide. Vaginal oestrogen after the menopause is well evidenced. Non-antibiotic options include D-mannose, cranberry and methenamine hippurate (Hiprex). Low-dose nightly antibiotics or a post-coital single dose can help selected patients, alongside self-initiated treatment guided by cultures. Immune options such as OM-89, bladder instillations with hyaluronic acid and chondroitin, and imaging to rule out a structural cause round out the plan.

Interstitial cystitis and bladder pain syndrome

A specialist, stepped approach.

Bladder-friendly diet (less acid, spice and caffeine), stress management and pelvic floor physiotherapy come first. Amitriptyline, gabapentin and pentosan polysulfate (Elmiron, now used more selectively following the MHRA maculopathy warning) are options. Bladder instillations with DMSO, heparin, lidocaine or hyaluronic acid, hydrodistension with fulguration of Hunner lesions, sacral nerve stimulation, intravesical botulinum toxin and, as a last resort, cystectomy sit further along the ladder. An MDT of urology, urogynaecology, pain medicine and specialist nurses is the right home for this condition.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society 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, urologist or urogynaecologist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Urinary tract infection (lower): antimicrobial prescribing (NG109).

  • NICE. Pyelonephritis (acute): antimicrobial prescribing (NG111).

  • NICE. Urinary tract infection (recurrent): antimicrobial prescribing (NG112).

  • NICE. Suspected cancer: recognition and referral (NG12) - visible haematuria pathway.

  • MHRA. Pentosan polysulfate (Elmiron): risk of pigmentary maculopathy.

  • European Association of Urology. Guidelines on urological infections.

Red flags

When cystitis needs urgent attention.

Most cystitis is manageable in primary care. These are the situations that need same-day review, admission or a specialist opinion.

  • Fever, rigors or loin pain

    Suggests pyelonephritis - a kidney infection that needs urgent assessment and, often, IV antibiotics.

  • Any UTI in a man

    Always considered complicated. Culture the urine, treat for seven days and refer to urology.

  • UTI in pregnancy

    Even asymptomatic bacteriuria in pregnancy is treated. Culture-guided antibiotics and obstetric review.

  • Sepsis or urosepsis

    High fever, low blood pressure, tachycardia, confusion or reduced urine output. Sepsis 6 and 999 or A and E.

  • Visible or persistent haematuria

    Visible haematuria in anyone over 45 meets 2WW criteria for suspected bladder cancer per NICE NG12.

  • Catheter-associated UTI

    Do not treat colonisation. Culture, treat true infection, and consider changing or removing the catheter.

  • Recurrent UTI

    Two or more infections in six months, or three in twelve months, warrants a proper preventive plan and imaging review.

  • Immunocompromise or diabetes

    Lower threshold to culture, image and treat for longer - and to admit if unwell.

  • Confusion in an older adult

    Do not miss a silent UTI. But do not overtreat either - dipsticks are unreliable over 65.

Living with it

A common condition, with a clear ladder.

Four things that make the biggest difference day to day - steady hydration, sensible habits, real prevention when episodes recur, and knowing when to step up to a specialist.

A quiet reminder

Repeat cystitis is not just bad luck.

If you are getting infection after infection, ask for a preventive plan and, when appropriate, imaging or cystoscopy. Support from Bladder Health UK and the Pelvic Pain Support Network can also help.

  1. 01 Hydration

    Drink through the day

    Steady fluid intake dilutes urine and helps flush bacteria - aim for pale, straw-coloured urine.

  2. 02 Habits

    Small changes that add up

    Wipe front to back, void after sex, avoid spermicides and choose cotton underwear - each has modest but real evidence.

  3. 03 Prevent

    Ask about prevention

    Vaginal oestrogen after the menopause, D-mannose, methenamine hippurate or low-dose antibiotics - the right option depends on your pattern.

  4. 04 Escalate

    Do not accept ongoing symptoms

    Chronic pelvic pain with urinary symptoms and negative cultures deserves a bladder pain syndrome referral, not more antibiotics.

Frequently asked

Everything we get asked about cystitis.

Quick answers on antibiotics, recurrent UTI, pyelonephritis and bladder pain syndrome.

  • What is cystitis?

    Cystitis means inflammation of the bladder. The most common cause is a bacterial urinary tract infection, but it can also be caused by radiation, chemotherapy (haemorrhagic cystitis), catheters or chronic non-infectious inflammation such as interstitial cystitis and bladder pain syndrome.

  • How is uncomplicated cystitis treated in women?

    A short three-day course of nitrofurantoin 100 mg twice a day or trimethoprim 200 mg twice a day, per NICE NG109. Plenty of fluids, paracetamol for pain and clear safety-netting are part of the plan. A urine culture is only needed if the infection does not settle or if there are complicating factors.

  • Why is a UTI in a man different?

    Male UTI is always considered complicated. It is much less common, more likely to involve the prostate or upper tract, and needs a longer seven-day course of a culture-guided antibiotic, a urology review and a check for prostatitis or structural cause.

  • What counts as recurrent UTI?

    Two or more infections in six months, or three or more in twelve months. That warrants a preventive plan - lifestyle measures, vaginal oestrogen if post-menopausal, non-antibiotic options such as D-mannose or methenamine hippurate, or low-dose antibiotic prophylaxis, and imaging or cystoscopy to rule out an underlying cause.

  • What is interstitial cystitis or bladder pain syndrome?

    A chronic non-infectious bladder condition causing pelvic pain, urgency and frequency, often with relief on voiding, and with negative urine cultures. Treatment is specialist-led - diet, pelvic floor physiotherapy, amitriptyline, bladder instillations, hydrodistension, neuromodulation and, rarely, more advanced surgery.

  • When should I go to A and E?

    Any combination of high fever, rigors, severe loin pain, vomiting, confusion, very low blood pressure, a fast heart rate or reduced urine output points to pyelonephritis or urosepsis. Call 999 or go to A and E - this is not something to wait out at home.

Related content

Keep reading.

Pulse Healthcare concierge

Send us your enquiry

A concierge service for UK private healthcare. We match you with the best vetted clinics and consultants in our network - they then contact you directly.

So we can match you to the right clinician close to you.

We reply to every enquiry within 24 hours (Mon–Fri). Confidential - your details are never shared outside our vetted consultant network.