I have occasional waves of moderate pain in my lower abdomen, probably in the intestine. It feels like gas or something is passing through a too small area. It can be a 5-6 on a scale of 1-10 pain. Usually, I will then either pass gas or go to the bathroom for a bowel movement. It comes and goes, sometimes for months at a time. It recently returned, then died down, now it will probably return because I just had a wave of it. I couldn t describe it accurately until I came across the phrase, waves of pain. I had a colonoscopy three years ago and the doc said there was nothing there. Could this be an aging colon that sometimes gets jammed? I have usual bowel movements, no diarrhea. My PCP is great but can t figure it out either. It doesn t get worse, but it jolts me. A major annoyance, but certainly something I can live with as long as I know I am not making it worse. Thanks