In my case, I believe it is primarily physical. Based on circumstances almost exactly a month before sudden onset, the most likely cause, I think, is low level PI that I wasn't aware of until IBS hit. No known family history, no long personal history of gut problems that many IBSers report, excellent physical and mental health for years, excellent diet and lifestyle habits, no abuse history, no recent trauma or prolonged stress. It was excruciating basically 24/7 for a year or so with all kinds of GI and related non-GI symptoms and almost no quality of life despite 2 matching diagnoses within days of onset, and very proactive self education and advocacy. Been there and done that with almost every reputable conventional or CAM treatment option appropriate to my situation. 95% of my stress was and probably still is because of IBS. When my symptoms finally improved significantly, which was very gradual, (lots of hypno, TCM, Provex CV) a lot of the stress went away, not the other way around.My symptoms aren't "typical," so my concerns aren't either. I have had to be a advocate my entire life, and did it professionally for several years. I continue to do it now for IBS. I don't have a lot of the anxieties many IBSers do about telling people or asking for help. My family knows, my health care providers know, my friends know, many colleagues and acquaintances know, many people in the IBS community know my real name. Most of them try their best to be supportive, but it's wearing on them too. Fortunately, major urgency is an intermittent thing, so I don't worry too much about where the bathroom is. I have *never* worried that I have cancer. In over 2 1/2 years of daily symptoms, probably only 6-7 times total have I seen a clear spike in overall symptoms that was clearly triggered by a stressful situation-- and it was never the same trigger. When I looked into professional CBT, rather than the self-help kind, I called a *lot* locally after consulting informally with several of the major experts in this for IBS for referrals, but I never found one who knew what to do with me or if it would help since I'm not IBS-D with the usual textbook stressors.In short, I've done almost everything humanly possible that IBSers are told to do to help ourselves and more, including putting myself out there publicly on a regular basis to raise awareness and advocate-- quickly, diligently and as consistently as I have been able from the very beginning of this illness. I don't claim to be perfect, but I really don't know how to cope any better, and many acknowledged experts in the IBS community don't have much else concrete to suggest that is new to me. But while the intensity of my symptoms has gone down a lot, they are still always there, every waking hour. If it's not one cluster of symptoms, it's another, and no, I don't have any other diagnosis that would explain why I have all these symptoms I never had for decades of my life. I know about brain-gut dysfunction, and I don't deny that it's in the equation somewhere, but some of us are more brain and some of us more gut. I'm told that when I was first scoped shortly after my initial diagnosis, before anyone had told me IBS is a chronic, incurable condition and when I fully expected to "recover" soon, that my colon was observed moving in an IBSy way under *general anesthesia*. If it was doing that when I was completely out, it's physical. If I still have this level of symptoms no matter what, it's physical.