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Cancer presents more as an increase in size of scrotum
or testicles than as pain.Occasional pain radiating to scrotum suggests you are suffering from ureteric pain.As pain arising from stone or some obstruction in ureter radiates to scrotum.So get your routine urine tested & ultrasound
abdomen & scrotum & plain X-ray KUB (kidney
,ureter ,bladder) done.
Wish you good health