If you are suffering from flank, back and/or abdominal pain that is a result of pancreatic cancer or pancreatitis, this procedure can offer you profound pain relief almost immediately.  A celiac plexus block is a commonly performed treatment for individuals suffering from abdominal and/or flank pain that has been caused by cancer. While most often used for pain secondary to pancreatic cancer, the target for this procedure (the celiac plexus) provides innervation for a large number of other structures in the abdomen, making the celiac plexus block ideal for a number of other painful conditions as well.