Hi canyonclub:There is another thread going on right now about lower back pain, and it seems that a lot of people with IBS experience it. I have it to, but it's due to an old muscle injury, which causes it to spasm now and then.One thing I have noticed about my back, though, is that I carry my stress there, right along the points you mention. If I'm hit with a very stressful situation everthing tightens up in those spots. If I don't destress I'm sure to have a muscle spasm within a day or two.So, yes, your problem could be associated with IBS, or you could have something else going on there. Try to remember what you were doing in the previous 24 hours, to see if there was anything that could have triggered it.JeanG