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This could indicate a urinary tract infection
or a bladder stone
. Get your urine tested and also take an X-ray/Ultrasound
KUB as per your Urologist's advice. Drink plenty od water, 2-3 litres a day for some days till pain reduces. Drink Cranberry juice as it is mildly antiseptic as well. Show to the Urologist as soon as you can.