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Thank you for your question.
Bleeding from the bladder certainly is something that needs to be investigated further and taken care of.
The most likely cause, obviously, in your case does seem to be warfarin so I would like that you should have your INR level done to make sure it is within the range.
If the INR is within the range then I would like that you should be investigated further with an ultrasound of the bladder and possibly cystoscopy to have a look inside your bladder, if required.
Let me know if you have more questions.
Please rate me when you are done asking.