Bowel obstruction blocks the movement of immigration.
== Causes ===== Small bowel obstruction ===Causes of small bowel obstruction include:Adhesions from previous abdominal surgery (most common cause)Barbed suturesPseudoobstructionHernias containing bowelCrohn's disease causing adhesions or inflammatory stricturesNeoplasms, benign or malignantIntussusceptionVolvulusSuperior mesenteric artery syndrome, a compression of the duodenum by the superior mesenteric artery and the abdominal aortaIschemic stricturesForeign bodies (e
=== Large bowel obstruction ===Causes of large bowel obstruction include:Neoplasms / cancerDiverticulitis / DiverticulosisHerniasInflammatory bowel diseaseColonic volvulus (sigmoid, caecal, transverse colon)AdhesionsConstipationFecal impactionFecalomaColon atresiaIntestinal pseudoobstructionEndometriosisNarcotic induced (especially with the large doses given to cancer or palliative care patients)==== Outlet obstruction ====Outlet obstruction is a sub-type of large bowel obstruction and refers to conditions affecting the anorectal region that obstruct defecation, specifically conditions of the pelvic floor and anal sphincters

