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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Blood clot with pain suggest likely bladder infection.
Bacteria like E coli can cause inflammation of the bladder wall, breaking of small blood vessel and the clot formation.
Usually not serious.
Another possibility can be passage of small kidney stone which can cause blood clot as well.
Without any recurrence, this is not likely any serious.
You should see your doctor for urinalysis as well. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for asking further questions!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/