Blood in the urine — whether visible (macroscopic) or detected on a dipstick (microscopic haematuria) — should always be assessed by a specialist. It does not always indicate cancer, but a cause should be identified through structured investigation.
- Blood in the urine with an inability to pass urine, or large clots blocking flow
- Fever alongside urinary symptoms or severe flank pain
- Sudden severe pain with no relief after 30 minutes
- Dizziness, fainting or signs of significant blood loss
Seeing red, pink, tea-coloured or cola-coloured urine is frightening. Sometimes the cause is treatable and non-cancerous, but visible haematuria should never be dismissed simply because it stops or does not hurt.
Blood may originate anywhere from the kidneys to the ureters, bladder, prostate or urethra. The correct next step is structured assessment—not guessing from colour alone.
Call emergency services or seek urgent care now if
- You cannot pass urine or are passing large clots
- Bleeding is heavy or accompanied by dizziness, fainting or weakness
- You have severe flank pain with fever or vomiting
- You are unwell after recent urological surgery or instrumentation
- Blood follows significant trauma
Possible causes of haematuria
- Urinary infection
- Kidney or ureteric stones
- Benign prostate enlargement or prostate inflammation
- Kidney disease
- Bladder, kidney, prostate or upper urinary-tract cancer
- Medication-related bleeding, although anticoagulants do not remove the need to investigate an underlying cause
- Recent exercise, procedures or trauma
Haematuria is the presenting symptom in the majority of bladder cancer diagnoses. Early investigation dramatically improves outcomes.
Painless blood still matters
Bladder and kidney cancers can present with painless visible blood. That does not mean cancer is the most likely explanation in every patient, but it is why prompt investigation is important.
What a urology assessment may include
- History, examination and urine testing
- Blood tests, including kidney function
- Imaging such as ultrasound or CT, depending on risk and presentation
- Flexible cystoscopy to inspect the bladder lining
- Additional urine or specialist tests when indicated
Can food or medicine change urine colour?
Beetroot, some medicines and dehydration can alter urine colour. Menstrual contamination can also confuse the picture. However, uncertainty should be resolved with a urine test rather than assumption.
Preparing for the appointment
- Record when the bleeding started and whether it was painful
- Note clots, urinary symptoms, fever, weight loss or flank pain
- Bring a medication list, including blood thinners
- Mention smoking history, occupational exposures and family history
- Take a photograph only if helpful and safe; do not delay care to collect evidence
Frequently asked questions
Yes, but persistent or recurrent blood may still need further evaluation after infection is treated.
Yes. A single unexplained episode should be assessed.
They can make bleeding more apparent, but an underlying urinary cause may still be present and should not be overlooked.
Blood detected on testing rather than seen with the eye. Its significance depends on persistence, age, symptoms and risk factors.
Many patients with unexplained visible haematuria are advised to have bladder inspection, but the exact pathway is individual.
Speak to Mr Torath Ameen
If you have concerns about urological symptoms or would like an expert opinion, book a consultation at our London or Hertfordshire clinics.
This article is intended for general patient education only. It does not constitute medical advice and may not apply to every individual's circumstances. Clinical decisions should always be made in consultation with a qualified healthcare professional. If you are concerned about your health, please seek prompt medical assessment.