Written by Mr Neil Haldar, Consultant Urological Surgeon. GMC 3683914. Last reviewed: [May 2026].
Quick Answer
Blood in urine (haematuria) should always be investigated, even if it occurs only once. Around 1 in 5 adults over 45 with visible blood in urine are found to have a urological cancer, most commonly bladder cancer. Painless visible haematuria is the single most important warning sign. UK NICE guidance (NG12) requires anyone aged 45 or over with unexplained visible haematuria to be seen by a urologist within two weeks.
If you have seen blood in your urine (blood in pee) — even once, even briefly — book a urology consultation. Do not wait for it to recur.
Key Takeaways
- Visible haematuria (pink, red, or cola-coloured urine) carries a 10–20% risk of underlying urological cancer in adults over 45.
- Non-visible haematuria (detected on dipstick or microscopy) carries a 3–5% cancer risk overall, rising with age.
- Painless blood in urine is more concerning than painful bleeding — it is the classic presenting feature of bladder cancer.
- The standard urology workup includes urine tests, a CT urogram, and flexible cystoscopy.
About the Author
I am Mr Neil Haldar, a Consultant Urological Surgeon at Buckinghamshire Healthcare NHS Trust, where I established and led the da Vinci robotic prostate surgery programme. My subspecialty practice covers urological cancer (prostate, kidney, bladder), with over 1,000 robotic prostatectomies and 600 laparoscopic renal cancer operations performed. I see private patients at The Chiltern Hospital in Great Missenden, The Clementine Churchill Hospital, Harrow, and other locations, serving patients in Buckinghamshire, Oxfordshire, Berkshire, and Hertfordshire.
I have written this guide to give patients a clear, evidence-based answer to one of the most common questions in my clinic: “I’ve seen blood in my urine — should I worry?”
What Is Haematuria?
Haematuria is the medical term for blood in urine. It falls into two clinically distinct categories:
| Type | Appearance | Detection | Cancer Risk in Adults 45+ |
|---|---|---|---|
| Visible haematuria (VH) | Urine appears pink, red, or cola-coloured | Seen by the patient | Approximately 10–20% |
| Non-visible haematuria (NVH) | Urine appears normal | Detected on dipstick, microscopy, or laboratory testing | Approximately 3–5% |
Both are clinically significant. Visible haematuria is the more concerning of the two and triggers an urgent (two-week-wait) referral under NICE guidance.
How Common Is Blood in Urine?
Haematuria affects an estimated 2–3% of adults attending primary care each year in the UK. The cause varies considerably:
- Around 60–70% of cases are due to benign conditions (infection, stones, an enlarged prostate, or no identifiable cause).
- Around 20–25% are caused by urinary tract infection.
- Around 10–20% of patients with visible haematuria over 45 are diagnosed with a urological cancer.
This is why structured assessment matters. The urologist’s role is not to assume the worst—it is to systematically exclude serious disease so benign causes can be confirmed and managed appropriately.
What Causes Blood in Urine? The Eight Most Common Causes
1. Urinary Tract Infection (UTI)
The single most common cause of haematuria in adult women. UTIs irritate the bladder lining, leading to micro-bleeding visible on dipstick or, less commonly, to the naked eye.
Typical features include burning with urination, urgency, frequency, lower abdominal discomfort, and cloudy or strongly odorous urine.
Important caveat: UTIs are uncommon in men. Any man with apparent UTI should be investigated for an underlying cause, particularly if over 50.
2. Kidney or Ureteric Stones
Stones cause bleeding by abrading the urinary tract lining.
Typical features: severe colicky pain in the flank radiating to the groin, nausea, vomiting, restlessness, and visible or non-visible blood in urine.
Even a small 3 mm stone can produce striking visible bleeding.
3. Benign Prostatic Hyperplasia (BPH)
In men over 50, an enlarged prostate is the most frequent benign cause of haematuria. Increased vascularity of the prostate gland produces fragile vessels that can bleed spontaneously.
Typical features: weak stream, hesitancy, incomplete emptying, urinary frequency, and nocturia (waking at night to urinate).
4. Bladder Cancer
The most common urological cancer linked to haematuria. Bladder cancer is the 11th most common cancer in the UK, with around 10,000 new cases each year. Approximately 80% of patients with bladder cancer present with painless visible haematuria.
Risk factors: age over 60, smoking history (current or past), male sex, occupational chemical exposure (rubber, dye, leather industries), and prior pelvic radiotherapy.
5. Kidney (Renal) Cancer
Around 13,000 people are diagnosed with kidney cancer in the UK each year. The classic triad of flank pain, a flank mass, and haematuria is now uncommon — most kidney cancers are detected incidentally on scans performed for other reasons. When haematuria is present, it indicates the tumour has invaded the collecting system.
6. Prostate Cancer
Prostate cancer rarely causes haematuria in its early stages. It is more commonly a feature of advanced disease, or it may coexist with BPH, the actual source of bleeding.
7. Vigorous Exercise
“Runner’s haematuria” is a well-recognised but transient phenomenon following endurance exercise.
Critical rule: any blood in urine following exercise must resolve completely within 48–72 hours. Persistent or recurrent post-exercise bleeding is not a benign diagnosis and requires investigation.
8. Anticoagulant Medication
Warfarin, direct oral anticoagulants (DOACs such as apixaban, rivaroxaban, edoxaban), and antiplatelet drugs (aspirin, clopidogrel) can produce or unmask haematuria.
Critical rule: anticoagulants should never be assumed to be the sole cause of bleeding. They commonly reveal an underlying lesion that would otherwise have remained silent. All patients on anticoagulants with haematuria still require a full urological assessment.
When Is Blood in Urine Serious? The Red Flags
Seek prompt urological review if any of the following apply:
- Visible blood in your urine (even one episode, even brief)
- Painless visible haematuria
- Age 45 or over with any visible haematuria
- Age 60 or over with non-visible haematuria
- Smoking history (current or past, including ex-smokers of more than 20 years)
- Weight loss, fatigue, or loss of appetite alongside haematuria
- Persistent urinary symptoms that do not settle after antibiotic treatment
- Recurrent UTIs in men, or in women over 60
- Clots in the urine or difficulty passing urine
The combination of age over 45 plus painless visible haematuria is the highest-risk presentation and should trigger same-week specialist review.
NICE Guidance on Haematuria (NG12)
The UK National Institute for Health and Care Excellence (NICE) sets clear thresholds for urgent cancer referral. Under guideline NG12 (Suspected cancer: recognition and referral):
| Patient Profile | NICE Recommendation |
|---|---|
| Adult aged 45+ with unexplained visible haematuria, without UTI | Refer using a suspected cancer pathway (2-week wait) |
| Adult aged 45+ with visible haematuria that persists or recurs after successful treatment of UTI | Refer using a suspected cancer pathway (2-week wait) |
| Adult aged 60+ with non-visible haematuria plus dysuria or raised white cell count on blood test | Refer using a suspected cancer pathway (2-week wait) |
Many GPs use these thresholds directly. If you meet any of these criteria, a 2-week-wait referral should be made. If you would prefer not to wait — or if you are below these age thresholds but remain concerned — a private consultation provides direct access to the same diagnostic pathway, usually within a couple of working days.
When Should You See a Urologist? A Simple Decision Guide
| Your Situation | Recommended Action |
|---|---|
| Painless visible haematuria | See a urologist within 2 weeks |
| Severe pain with haematuria | Same-day GP or A&E review |
| Inability to pass urine, fever, or sepsis | A&E immediately |
| Non-visible haematuria, age 60+ | Urology referral |
| Non-visible haematuria, under 60, no symptoms | GP review and repeat dipstick |
| Recurrent UTIs in a man | Routine urology referral |
| Recurrent UTIs in a woman over 60 | Routine urology referral |
| Visible painless haematuria on anticoagulant medication | Urology referral — do not assume the drug is the cause |
What Tests Will the Urologist Arrange?
A modern urology haematuria pathway has three components, usually completed in a single visit or over 1–2 appointments.
1. Urine and Blood Tests
- Urine dipstick, microscopy, and culture
- Urine cytology (looking for cancer cells)
- Blood tests for kidney function, full blood count, and PSA in men, where appropriate
2. Imaging
CT urogram is the gold-standard imaging test for haematuria. It is a contrast-enhanced CT scan of the kidneys, ureters, and bladder, capable of detecting:
- Stones
- Kidney tumours
- Ureteric tumours
- Anatomical abnormalities
In selected younger patients with low-risk features, ultrasound may be used as an initial test.
3. Flexible Cystoscopy
A small flexible camera is passed into the bladder under local anaesthetic. It takes around 5 minutes, is well tolerated, and is the only reliable way to exclude bladder cancer. Cystoscopy is the single most important test in any haematuria pathway.
The full pathway — consultation, urine and blood tests, CT urogram, and cystoscopy — can typically be completed within 5–10 working days in a private setting.
Why Early Diagnosis Matters
For bladder cancer, stage at diagnosis is the strongest predictor of outcome. Non-muscle-invasive bladder cancer detected early has a 5-year survival of over 90%. Muscle-invasive disease has a 5-year survival of around 50%. The difference between these two presentations is often a matter of months—the time from first noticing blood in the urine to receiving a diagnosis.
The same principle applies to kidney cancer. Tumours detected when small and confined to the kidney are typically curable with partial nephrectomy. Tumours detected late may require radical surgery or systemic therapy.
This is why I encourage every patient with haematuria — visible or non-visible — to be assessed promptly. The vast majority will receive reassurance. A small but important minority will benefit from earlier intervention than would otherwise have been possible.
Haematuria in Specific Groups
Men
In men, the differential is dominated by BPH and bladder cancer. Any man over 50 with visible haematuria requires urological assessment regardless of other symptoms. UTIs in men are unusual and should themselves prompt investigation.
Women
UTIs are the most common cause in women, particularly under 50. However, haematuria should never be attributed to infection without:
- A positive urine culture
- Resolution of bleeding after antibiotic treatment
- Confirmation on follow-up dipstick
If any of these are missing, a urological referral is appropriate.
Younger Adults (Under 40)
Causes are more often benign — infection, stones, exercise-related bleeding, or thin basement membrane disease (a benign kidney condition). However, persistent or unexplained haematuria still warrants assessment, including in young adults.
Patients on Anticoagulants
A particularly important group. Anticoagulants do not cause haematuria de novo — they unmask underlying pathology. Investigation should not be deferred on the assumption that the medication is responsible.
Frequently Asked Questions
Is blood in urine always cancer?
No. Around 80–90% of haematuria cases have a benign cause. However, because cancer accounts for a clinically significant minority, all cases should be properly assessed.
Can dehydration cause blood in urine?
Dehydration does not directly cause haematuria. It can darken urine (making it appear cola-coloured) and may worsen kidney stones, but you should not attribute blood in urine to dehydration without proper investigation.
Should I go to A&E for blood in urine?
A&E is appropriate if you have severe pain, an inability to pass urine, fever, sepsis symptoms, or are passing significant clots. For isolated visible haematuria without these features, urgent outpatient urology review is more appropriate than A&E attendance.
Can blood in urine resolve on its own?
Yes — bleeding from bladder cancer, kidney stones, and prostate conditions is typically intermittent. The bleeding stopping does not mean the cause has resolved. A single episode is enough to warrant assessment.
How long does the haematuria pathway take privately?
In my private practice, I typically complete the full assessment — consultation, urine and blood tests, CT urogram, and flexible cystoscopy — within 5–10 working days.
Does a normal CT scan rule out cancer?
No. A CT urogram is excellent for detecting kidney and ureteric tumours, but bladder cancer can only be reliably excluded by cystoscopy. Both tests are required for a complete haematuria assessment.
Can I have a cystoscopy without a general anaesthetic?
Yes. A flexible cystoscopy is performed under local anaesthetic in the outpatient clinic. It takes around 5 minutes, and most patients tolerate it very well.
Should I stop my blood thinners if I see blood in my urine?
No — do not stop anticoagulants without medical advice. The risks of stopping (stroke, clot, heart attack) are usually greater than the bleeding itself. Speak to your GP or urologist promptly so they can manage the situation correctly.
Is non-visible haematuria a 2-week-wait condition?
Only in specific circumstances. Under NICE NG12, non-visible haematuria triggers an urgent referral for adults aged 60 or over with either dysuria or a raised white cell count on blood testing. Outside these criteria, it warrants routine urological assessment.
What if my GP says it’s just a UTI?
If you have been treated for a UTI but bleeding persists, or you are over 45 with visible haematuria, NICE guidance recommends a 2-week wait for a urology referral regardless of whether infection is present. If you are uncertain, a private consultation gives you direct access to specialist assessment.
What to Do Next
If you have noticed blood in your urine — once or repeatedly, with or without symptoms — the right next step is a structured urological assessment.
In my private practice, I offer:
- Same-week consultant-led consultation
- Full diagnostic pathway completed within 5–10 working days
- CT urogram and flexible cystoscopy under one roof
- Continuity of care through to treatment if required
To book an urgent appointment:
Final Word from the Author
In my experience, patients fall into two groups: those who come early and those who come late. The first group almost always leaves reassured. The second group sometimes leaves with a diagnosis that could have been caught sooner.
Blood in urine is a symptom, not a diagnosis. It deserves an answer.
If you have seen it, please act on it.
— Mr Neil Haldar, Consultant Urological Surgeon
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This article is intended for general information and does not replace individual medical advice. If you have specific concerns about your urinary health, please consult a qualified urologist.
Mr Neil Haldar is a UK Consultant Urological Surgeon specialising in prostate cancer, robotic surgery, uro-oncology and paediatric urology. He offers expert diagnosis, treatment and second opinions for complex urological conditions.