How often is this happening when you urinate? Please know that I am not a doctor or a gynecologist but if this were me, I would go the doctor to get this symptom checked out.
Passing tissue while urinating appears to be a symptom of renal pappilary necrosis but there are a lot of other symptoms to this condition as well.
Does it look more like mucus? Sometimes this can be caused by a urinary tract infection.
The only way to know what could be causing this symptom is to see your doctor. Please let us know what your doctor says.
Thank you for your question.
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