I've been practicing Iyengar yoga for about 5 years now, and dealing with IBS (or something like it) for about 9 years. Most of the time, I'm fine, but every month or two I get these intestinal episodes with discomfort, racing heart, frequent urgent BM's, and if it's bad enough, insomnia, diarrhea, mild fever, chills, & vomiting. They last between 1 and 24 hours, depending on severity.What I'm finding, after a lot of experimentation, is that yoga inversions (where your pelvis is higher than your heart) do me a world of good when I start having symptoms, especially passive/supported inversions. Last week, for the first time, I actually averted what was shaping up to be a moderately bad intestinal episode and was feeling nearly normal in about 3 hours, instead of the 24+ hours it normally takes.I don't recommend trying inversions without having a yoga teacher show you how not to hurt yourself, but none of the other poses have specifically helped me with IBS. In fact, some (mostly twists) seem to make my symptoms worse when my intestines are feeling ornery or sensitive. Most poses involve lifting the pit of the abdomen, and I have to be *very* careful about that or I can make things worse.FYI, my IBS symptoms are generally stress-related, as I've removed all the dietary triggers I've identified. The inversions I do have a tremendously soothing effect. I think they also confuse my intestines by putting them upside-down, sorta changing their perspective and giving them a little space to breathe, so to speak.For those familiar with the poses, here are the ones that help me: Supported sarvangasana (shoulderstand) with bolsters and chair, supported shirshasana (headstand) between chairs, viparita karani (back on floor, butt on firm cushion or bolster, legs/feet up the wall), ardha chandrasana (half-moon pose) with my back and raised leg against the wall.I also have this purple foam portable massage table that allows me to lie face-down with my face supported in a donut cushion (no twisted necks). It's very soothing, and the model I have has a depression for the abdomen, so it's not too much pressure there during sensitive times. When I'm having an IBS episode, I can't comfortably lie on my back or side; that makes my symptoms worse.As with all things, YMMV. Hope this helps someone else as much as it's helped me. I'm happy to answer any questions I can, either here or privately.Lissa