Is ileus with fecal stasis dangerous?

Not usually. An ileus is a slowing down of the motility or flow through the bowel, and can occur typically when someone is taking a lot of pain meds, or has recently had a big operation. Some metabolic problems can cause it also. It generally doesn't require an operation, contrary to a bowel obstruction, which may. It is sometimes difficult to distinguish between the two. A surgeon can help differentiate.