Hi Linda. Are you having any problems with your bowel movements (e.g. hard stool, cramping, urgency, diarrhea)?
The intermittent nature is a good sign, especially if there are no associated symptoms. That said, this could represent an irritation in your sigmoid colon, resulting in intermittent spasms. Triggers could be hard stool, trapped gas, colitis, diverticulitis, less likely a polyp or tumor. Similarly, the ureter passes through this area and tiny stones could be getting stuck temporarily on their way into the bladder and out the urine. The fallopian tube and ovary also live in this area, so cysts would have to be considered. For a complete work up, you would need a brief physical exam, an xray or CT scan, possibly an ultrasound to look at the ovarian region, or a colonoscopy to look inside the colon.