<prompt> The most common cause of small intestinal obstruction is -IntussusceptionIatrogenic adhesionsTraumaCarcinoma  <response>: Ans is b i.e., Iatrogenic adhesions Adhesions secondary to previous surgery are by for the most common cause for small bowel obstruction. Adhesions paicularly after pelvic surgery are responsible for more than 60 of causes of small bowel obstructions - Sabiston Causes of small bowel obstruction in order of frequency :Sabiston Adhesions -60 Commonest Malignant tumors 20 Second most common cause. Most commonly, these tumors are metastatic lesions Hernias -10 Crohns disease -5 