<prompt> Commonest cause of acute intestinal obstruction is:AdhesionsVolvulusInguinal herniasInternal hernias  <response>: SMALL BOWEL OBSTRUCTION - Adhesions secondary to previous surgery are the MC cause of SBO. - Causes: Adhesions 60 Malignant tumors 20 Hernia 10 Crohns disease 5Q. - Primary colonic cancers paicularly those arising from the cecum and ascending colon may present as a SBO. 