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Blood in urine: causes, warning signs & what to do
Blood in the urine (haematuria), whether visible or found on a test, always needs to be explained — even if it is painless and happens once.
Common causes of blood in urine
- Urinary tract infection
- Kidney or bladder stones
- An enlarged prostate in men
- Kidney disease
- Vigorous exercise (temporary)
- Bladder or kidney tumours
When to see a doctor urgently
- Inability to pass urine, or passing clots with severe pain — seek urgent care
- Blood in urine with fever and flank pain (kidney infection)
- Heavy bleeding with dizziness
- Any visible blood in urine — always get it checked, even once
Frequently asked questions
Is painless blood in urine serious?
Painless visible blood in the urine must always be investigated, as it can be an early sign of a bladder or kidney tumour — even when it happens only once.
Can a UTI cause blood in urine?
Yes — infections commonly cause blood and burning. But because other causes exist, a test and sometimes further checks are done to be sure.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.