Why do I have brown blood in my urine after an activity?

Q. Can strenuous activity cause blood in the urine?

Answered by
Dr. Saurabh Subhash Pandya
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Aug 24, 2022 and last reviewed on: Aug 23, 2023

Hello doctor,

Two weeks ago, I observed brown blood in my urine after a 10-kilometer run. Also, I felt unwell and had stomach pain. However, a few hours after drinking, I did not notice any blood in my urine. A few days later, I visited a doctor who tested my urine and found blood and protein in my urine. However, there were no signs of infection. I again had brown blood in my urine after cycling for 100 kilometers. I got tested for kidney function and PSA, and both the reports were normal. When I am testing my urine sample at home, everything is fine in the morning, but there is blood in the urine after an activity like walking. Also, my blood pressure and blood sugar levels are normal. Should I be concerned?

Kindly suggest.



Welcome to icliniq.com.

I understand your concern.

It should be exercise-induced hematuria (blood in urine). It is a benign, self-limiting condition resulting in bleeding from kidney filters after exercise. I suggest you to consult a nephrologist for this. Also, adequate hydration during and after exercise and avoiding strenuous activity can help. I also suggest you to get a KUB (kidney, ureter, and bladder) CT (computed tomography) scan and urine cytology to detect malignant cells.

I hope this helps.

Do revert in case of further queries.

Thank you.

Hello doctor,

Thank you for your answer.

My GP also confirmed your diagnosis. However, I will ask her to do the suggested tests. Can blood in urine occur even after light exercise like walking for 30 minutes, or is it due to my strenuous activity four to five days back? My urine test kit has 100 kits, so I am getting tempted to test a couple of times a day. Am I overanalyzing the problem, and should I leave further conclusions to professionals?

Kindly advise.



Welcome back to icliniq.com.

Many times there may be hematuria with slight exertion, and there may be no hematuria even with more exertion. It may go away for a few days and come back randomly. If the CT scan and cytology reports are normal, your doctor may suggest an office cystoscopy. If that is also normal, there is nothing to worry about.

I hope this helps.

Thank you.

Hi doctor,

Thanks for your answer.

Unfortunately, I again observed visible blood in my urine today after exercising. It is clear that exercising triggers this, but I never had it before, and now it has happened three times in two weeks. I am worried and obviously will go to the doctor for further investigating. As it is very clearly related to exercising, can you think of any mechanism causing this, or is bleeding from the kidneys still likely?

Please give me your suggestions.



Welcome back to icliniq.com.

Usually, hematuria is limited to less than 72 hours after the exertion and depends more on the intensity than the duration. For example, athletes get hematuria after finishing a four to five kilometer run within a fixed time compared to running the same distance without a time limit. The bleeding can be due to minor trauma, leak from kidney filters, kidney movements, vessel spasms, etc.

I hope this was helpful.

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