All consecutive patients with surgical obstructive jaundice attending Gastrointestinal surgery and medicine OPD at AIIMS will be evaluated with a detailed history and clinical examination, liver function tests and an ultrasound abdomen. Those patients who have liver function tests and an ultrasound suggestive of lower end block will be further evaluated with a contrast enhanced CT and side viewing endoscopy (biopsy whenever possible) to characterize the nature of block.