A type of ILEUS, a functional not mechanical obstruction of the INTESTINES. This syndrome is caused by a large number of disorders involving the smooth muscles (MUSCLE, SMOOTH) or the NERVOUS SYSTEM. The phenotype is EFO_1000988 (intestinal pseudo-obstruction). Also known as: Intestinal Pseudo-Obstruction, Pseudo-obstruction of intestine (disorder), intestinal Pseudo-obstruction, intestine pseudoobstruction.