Cystitis
A complete, NICE NG112–aligned guide to cystitis and UTIs — covering what cystitis is, causes and symptoms, antibiotic treatment options, how to get an online prescription, and when to seek urgent care.
2-minute consultation reviewed by a UK clinician
We check your answers and recommend a suitable option
Plain packaging to your door, fast and confidential
Cystitis & UTI in Women: Complete Clinical Guide UK
Cystitis is a bacterial bladder infection (UTI) causing burning urination, frequency, and lower abdominal pain. It affects around 50% of women at some point. In the UK, NICE recommends nitrofurantoin as the first-line antibiotic. Most women can be assessed and prescribed online — no GP appointment needed.
Medical disclaimer: This guide is for information only and does not replace professional medical advice. If you have a fever, loin pain, are pregnant, or feel very unwell, seek urgent medical care. Access Doctor’s online service is for adult women with uncomplicated lower UTI symptoms only.
Think You Have Cystitis?
Complete a free, confidential online consultation reviewed by GPhC-registered pharmacist independent prescribers. NICE-guideline prescribing — nitrofurantoin or trimethoprim dispatched for next-day delivery.
Start Cystitis Consultation →What Is Cystitis?
Cystitis is inflammation of the bladder lining, almost always caused by a bacterial urinary tract infection (UTI). It is one of the most common infections seen in UK general practice, affecting around 50% of women at some point in their lifetime. Each year, approximately 3 million GP consultations in the UK are for UTI.
The vast majority of cystitis cases are caused by Escherichia coli (E. coli), a bacterium normally found in the bowel, which enters the urethra and ascends to the bladder. Because the female urethra is short and positioned close to the anus, women are disproportionately affected compared with men.
Non-infectious causes of cystitis — including radiation therapy, certain chemotherapy drugs, and irritating hygiene products — exist but are far less common than bacterial UTI in otherwise healthy women.
Cystitis vs UTI: The terms are used interchangeably in most clinical contexts. Technically, a UTI can affect any part of the urinary tract. Cystitis specifically refers to infection of the bladder. For otherwise healthy women presenting with lower urinary tract symptoms, the distinction rarely affects management.
Symptoms of Cystitis in Women
The classic symptom cluster of bacterial cystitis develops rapidly — often over a few hours — and is usually unmistakable in women who have experienced it before.
- Dysuria — a burning or stinging sensation when passing urine
- Urinary frequency — needing to pass urine much more often than usual
- Urgency — a sudden, compelling need to urinate that is difficult to defer
- Cloudy or dark urine — caused by bacteria, white blood cells, and mucus
- Haematuria — blood in the urine, which may appear pink, red, or brown
- Suprapubic discomfort — lower abdominal pressure or cramping
- Malodorous urine — an offensive or stronger-than-usual smell
Symptoms that are NOT typical of simple cystitis: Fever above 38°C, back or loin pain, rigors, nausea and vomiting, and feeling systemically unwell suggest the infection may have spread to the kidneys (pyelonephritis). These require urgent in-person assessment — not online prescribing.
Causes and Risk Factors
Understanding what predisposes women to cystitis helps inform prevention as well as treatment decisions.
Common bacterial causes
Escherichia coli accounts for around 80–85% of community-acquired UTIs in women. Other causative organisms include Staphylococcus saprophyticus (common in younger sexually active women), Klebsiella pneumoniae, Enterococcus faecalis, and Proteus mirabilis.
Sexual Activity
Intercourse increases the risk of UTI by facilitating bacterial transfer to the urethra. “Honeymoon cystitis” refers to recurrent UTI in newly sexually active women.
Anatomy
The short female urethra (approximately 4 cm) and its proximity to the anus makes ascending infection easier than in men.
Menopause
Declining oestrogen reduces protective vaginal lactobacilli, raising vaginal pH and increasing susceptibility to colonisation by uropathogens.
Contraception
Diaphragm use and spermicide-coated condoms alter vaginal flora and increase UTI risk. The oral contraceptive pill does not appear to increase risk.
Incomplete Emptying
Residual urine in the bladder provides a growth medium for bacteria. Underlying causes include constipation, prolapse, and neurological conditions.
Diabetes
Glycosuria provides a nutrient source for bacteria; impaired immunity further increases susceptibility. Women with diabetes have up to three times the UTI risk of non-diabetic women.
How Is Cystitis Diagnosed?
In otherwise healthy, non-pregnant women under 65 presenting with two or more of the classic symptoms (dysuria, frequency, urgency, haematuria), NICE guidance supports a clinical diagnosis and treatment without routine urine culture. This is the basis for safe online prescribing.
When is a urine culture needed?
A midstream urine (MSU) sample sent for culture and sensitivity is recommended in the following situations:
- Symptoms that fail to resolve or recur within two weeks of treatment
- Recurrent UTI (two or more infections in six months)
- Pregnancy (where UTI always requires treatment and culture confirmation)
- Men, children, or catheterised patients with UTI symptoms
- Suspected complicated UTI (upper tract involvement, structural abnormality, immunosuppression)
Dipstick testing
Urine dipstick analysis is commonly used in primary care. A positive result for nitrite (indicating Gram-negative bacterial growth) combined with a positive leucocyte esterase (indicating pyuria) strongly supports bacterial UTI. A negative dipstick does not rule out infection in symptomatic women — NICE supports treating based on symptoms alone.
Treatment Options
Antibiotic treatment (first-line)
Antibiotics are the definitive treatment for bacterial cystitis. NICE guideline NG109 (updated 2022) recommends prescribing based on local resistance patterns. The two most commonly used first-line antibiotics in the UK are nitrofurantoin and trimethoprim (see comparison below).
Self-care alongside antibiotics
The following measures can help manage symptoms while antibiotics take effect. They do not replace antibiotic treatment but may reduce discomfort:
- Drink plenty of water (at least 1.5–2 litres per day) to help flush bacteria from the bladder
- Take paracetamol or ibuprofen to relieve pain and discomfort
- Avoid sexual intercourse until symptoms have fully resolved and the antibiotic course is complete
- Urinate promptly when you feel the urge — do not hold urine
- Use a heat pad on your lower abdomen to ease cramping discomfort
- Avoid caffeinated drinks, alcohol, and citrus juices, which may irritate the bladder
Do cystitis sachets (sodium citrate / potassium citrate) work? Over-the-counter alkalising agents can temporarily reduce the burning sensation by raising urinary pH. They do not treat the underlying bacterial infection and should not substitute antibiotic therapy in confirmed or suspected bacterial UTI.
Nitrofurantoin vs Trimethoprim: Which Antibiotic?
NICE NG109 recommends nitrofurantoin as the preferred first-line antibiotic for uncomplicated UTI in non-pregnant women. Trimethoprim remains available as a second-line alternative but is no longer recommended as first choice due to rising resistance rates.
| Feature | Nitrofurantoin | Trimethoprim |
|---|---|---|
| NICE position (NG109) | First-line | Second-line (where resistance <20%) |
| Standard dose | 100 mg MR twice daily for 3 days | 200 mg twice daily for 7 days |
| Course length | 3 days | 7 days |
| Mechanism | Damages bacterial DNA / cell wall | Blocks bacterial folate synthesis (dihydrofolate reductase inhibitor) |
| Coverage | Excellent vs E. coli; low resistance rates | Broad Gram+/– activity; ~30–40% E. coli resistance in some UK areas |
| Avoid in | eGFR <45 mL/min; late pregnancy; G6PD deficiency | First trimester of pregnancy; folate deficiency; some drug interactions (warfarin, methotrexate) |
| Common side effects | Nausea, headache; urine may turn yellow/brown | Nausea, rash, headache; rarely Stevens-Johnson syndrome |
Your prescriber will select the most appropriate antibiotic based on your medical history, any recent antibiotic use, renal function, and local resistance data. If symptoms do not improve within 48 hours of starting treatment, contact your prescriber as a different antibiotic may be needed.
Getting Cystitis Treatment Online in the UK
Since the introduction of pharmacist independent prescribing in the UK, GPhC-registered pharmacist independent prescribers are legally authorised to prescribe prescription-only medicines — including nitrofurantoin and trimethoprim — following an online clinical assessment. Access Doctor operates within this framework, regulated by the General Pharmaceutical Council (GPhC registration #9011198).
- 1
Complete the online consultation
Answer a short symptom questionnaire about your current UTI symptoms, medical history, and any recent antibiotic treatment. This takes approximately 3–5 minutes.
- 2
Prescriber review
A GPhC-registered pharmacist independent prescriber reviews your answers. If safe and appropriate, a prescription is issued for nitrofurantoin or trimethoprim based on NICE NG109 guidance.
- 3
Medication dispatched
Your antibiotic is dispensed from our GPhC-registered pharmacy and dispatched for next-day delivery in discreet packaging with a patient information leaflet.
- 4
Follow-up if needed
If symptoms do not improve within 48–72 hours, contact the clinical team. If symptoms recur within two weeks, a urine culture and GP referral will be recommended.
Who cannot use Access Doctor’s online UTI service? The service is for adult women (≥18) with uncomplicated lower UTI symptoms only. You should seek in-person care if you are pregnant, have a fever, loin or back pain, are immunocompromised, have a structural urinary tract abnormality, or have had three or more UTIs in the past year.
No GP Appointment Needed
GPhC-registered prescribers. NICE-compliant antibiotics. Next-day delivery. Completely confidential. Treat your UTI today without waiting for a GP appointment.
Treat Cystitis Online →Recurrent Cystitis: When UTIs Keep Coming Back
Recurrent UTI is defined as two or more confirmed infections within six months, or three or more within twelve months. Around 25% of women who experience a UTI will develop recurrent infections.
Contributing factors
Common reasons why UTIs recur include sexual intercourse as a trigger, post-menopausal vaginal atrophy reducing protective lactobacilli, incomplete bladder emptying, colonisation with antibiotic-resistant bacteria, and in some women, an underlying genetic susceptibility to bacterial adhesion to the bladder wall.
Preventive strategies
- Post-coital prophylaxis: A single antibiotic dose taken after intercourse can significantly reduce UTIs triggered by sexual activity (under GP supervision)
- Low-dose maintenance antibiotics: Continuous low-dose antibiotic prophylaxis (e.g. nitrofurantoin 50 mg nightly) is effective for women with frequent recurrences — requires GP prescription and regular review
- Vaginal oestrogen: Post-menopausal women may benefit from topical oestrogen to restore lactobacilli-dominant flora and reduce UTI recurrence
- D-Mannose: Some evidence supports daily D-mannose supplementation as a non-antibiotic preventive measure, though evidence quality is moderate
- Methenamine hippurate: An antiseptic urinary acidifier that may reduce recurrence rates; NICE supports its use as an alternative to prophylactic antibiotics in some women
- Behavioural measures: Voiding after intercourse, staying well-hydrated, avoiding irritant products, and wiping front-to-back may all reduce risk
Women with three or more UTIs in twelve months should be referred to a GP for a formal review. Investigations may include renal ultrasound and cystoscopy to exclude anatomical causes.
When to Seek Urgent Help
Seek urgent medical care immediately if you develop any of the following:
- Fever above 38°C (feeling hot, shivery, or sweaty)
- Pain in your back, sides (loin), or just below your ribs
- Nausea and vomiting alongside urinary symptoms
- Rigors (uncontrollable shaking or chills)
- Feeling very generally unwell, confused, or faint
- Symptoms that do not improve after 48 hours of antibiotics
- Blood in urine if you have never had this before and are over 45
These symptoms may indicate that infection has spread from the bladder to the kidneys (pyelonephritis) or, rarely, to the bloodstream (urosepsis). Both are medical emergencies that require in-person assessment, IV antibiotics, and possible hospitalisation.
All Cystitis & UTI Guides
Frequently Asked Questions
What is cystitis?
Cystitis is inflammation of the bladder, almost always caused by a bacterial urinary tract infection. It is the most common bacterial infection in women in the UK, causing burning urination, urinary frequency, and lower abdominal discomfort. Most cases are treated with a short antibiotic course.
What is the first-line antibiotic for cystitis in the UK?
NICE guideline NG109 recommends nitrofurantoin as the preferred first-line antibiotic for uncomplicated UTI in non-pregnant women. It is prescribed as 100 mg modified-release twice daily for 3 days. Trimethoprim (200 mg twice daily for 7 days) is offered as a second-line alternative where local resistance rates are below 20%.
Can I get cystitis antibiotics online without seeing a GP?
Yes. GPhC-registered pharmacist independent prescribers at Access Doctor can assess your symptoms online and, where appropriate, prescribe nitrofurantoin or trimethoprim without a GP appointment. Medication is dispatched for next-day delivery in discreet packaging.
How quickly do antibiotics work for cystitis?
Most women notice significant symptom improvement within 24–48 hours of starting antibiotics. The full course should always be completed — 3 days for nitrofurantoin, 7 days for trimethoprim — even when symptoms resolve. If symptoms persist beyond 48–72 hours of treatment, contact your prescriber.
Can cystitis go away without antibiotics?
Mild symptoms occasionally resolve within a few days in otherwise healthy, non-pregnant women. However, NICE guidance recommends antibiotic treatment for most women to shorten illness duration and prevent spread to the kidneys. Self-care alone is not appropriate if symptoms are moderate, severe, or worsening.
What are the red flag symptoms of cystitis?
Seek urgent in-person medical care if you develop a fever above 38°C, back or loin pain, nausea and vomiting, rigors, or feel very generally unwell. These may indicate pyelonephritis (kidney infection) or urosepsis — both of which require urgent hospital-level assessment.
Is cystitis the same as a UTI?
The terms are often used interchangeably. Technically, a UTI can affect the whole urinary tract (urethra, bladder, ureters, kidneys). Cystitis specifically means infection of the bladder. For otherwise healthy women with lower urinary tract symptoms, the distinction rarely matters for treatment decisions.
What causes recurrent cystitis?
Recurrent UTI (two or more in six months, or three or more in twelve months) affects around 25% of women who experience an initial infection. Common causes include sexual activity as a trigger, post-menopausal hormonal changes, incomplete bladder emptying, and antibiotic-resistant bacteria. Options include post-coital prophylaxis, low-dose maintenance antibiotics, vaginal oestrogen (post-menopausal women), and D-mannose supplementation.
What is the difference between nitrofurantoin and trimethoprim?
Both are antibiotics used to treat UTIs. Nitrofurantoin is the current NICE first-line choice — it has low resistance rates, a 3-day course, and excellent activity against E. coli. Trimethoprim is a second-line alternative with a 7-day course; it is no longer first-line because E. coli resistance rates are approximately 30–40% in parts of the UK. Your prescriber will choose the most appropriate option for your circumstances.
Can men get cystitis?
Yes, but it is far less common in men. UTIs in men are more likely to indicate an underlying anatomical or prostatic problem and should always be assessed in person by a GP. Access Doctor’s online cystitis service is available to adult women only.
References & Clinical Guidelines
- National Institute for Health and Care Excellence. Urinary tract infection (lower): antimicrobial prescribing. NICE guideline NG109. Updated October 2022. nice.org.uk/guidance/ng109
- National Institute for Health and Care Excellence. Urinary tract infection (recurrent): antimicrobial prescribing. NICE guideline NG112. October 2018. nice.org.uk/guidance/ng112
- UK Health Security Agency. English Surveillance Programme for Antimicrobial Utilisation and Resistance (ESPAUR) Report 2022–23. UKHSA, 2023.
- Foxman B. Epidemiology of urinary tract infections: incidence, morbidity, and economic costs. American Journal of Medicine. 2002;113(Suppl 1A):5S–13S.
- General Pharmaceutical Council. Standards for Registered Pharmacies. GPhC, 2022. pharmacyregulation.org
- Hooton TM. Uncomplicated urinary tract infection. New England Journal of Medicine. 2012;366(11):1028–1037.
- Mody L, Juthani-Mehta M. Urinary tract infections in older women: a clinical review. JAMA. 2014;311(8):844–854.
