<prompt> Most common cause of acute intestinal obstruction isSmall bowel adhesionsIntussusceptionTuberculosisMalignancy  <response>: Intra-abdominal adhesions related to prior abdominal surgery account for up to 75 of the cases of small bowel obstruction. Intestinal Obstruction CausesIntraluminal 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, gallstone obstruction, mesenteric vascular occlusion.Vomiting is a more prominent symptom with proximal obstructions than distal. 