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In women, ovary, tubes and others may be responsible...
In both sexes, it may be the ureter
, bladder or bowel (colon
An examination by your doctor will shed some light.
Some lab work like urine and stool / plain x-ray of abdomen or ultra sound
may be necessary based on clinical suspicion
In the meantime, antispasmodic may give pain relief
Wishing speedy recovery