<prompt> Most common causeof acute intestinal obstruction is :Small bowel adhesionsIntussusceptionTuberculosisMalignancy  <response>: Intra-abdominal adhesions related to prior abdominal surgery account for upto 75 of the cases of small bowel obstruction. Intestinal ObstructionCausesIntraluminal Eg. Foreign bodies, gallstones, or meconiumIntramural Eg. Tumors, Crohns disease associated inflammatory stricturesExtrinsic Eg. Adhesions, hernias, or carcinomatosisClinical Presentation :Colicky abdominal pain, nausea, vomiting, abdominal distension and constipation are seen.Constipation is not seen in : Richters hernia obstruction, gall stone obstruction, mesenteric vascular occlusion.Vomiting is a more prominent symptom with proximal obstructions than distal. 