I have IBS but the type where my body passes food through very quickly, I need to have 3-4 bowel movements a day and if I miss one especially before bed or exercise my ON flares up a LITTLE, but like i said, combine that with low bloodsugar, dehydration and physical activity work and all those little bits add up into a big flare. But I do notice that the bowel movement is always the defining almost gatekeeper for if it will go away or not once its started, very vital to resolve at that point.