History: I have had IBS and issues with iliopsoas muscles in my stomach.
I have issues with my iliopsoas muscles and my chiropractor helped a lot with that, which in turn has helped my IBS. But everybody's body is different. They are actually ligaments that run from the rib area to the groin area bilaterally. They can get very tight and cause cramping and bowel issues. I've had these issues for a very long time. I also worked at a job where I sat in front of the computer all day and that didn't help matters. I have difficulty doing the stretches myself so my chiropractor has helped with it.
It's called the iliopsoas muscle (not sure if it's spelled correctly) and broad ligaments.