The caudal block has been used as an alternative to general anesthesia in specific circumstances such as anal surgery, perineal surgery or surgery of lower extremity etc. It has been also used as an adjunct to general anesthesia, administered at the completion of surgery to provide postoperative analgesia especially in children. But, it has variable complications such as generalized intoxication, pain on the injection site, infection or urinary retention etc. We report an unusual case of metastatic sacrococcygeal tumor from adenocarcinoma of lung presenting as severe anal pain and sciatica which was aggravated after the trial of caudal anesthesia.