A celiac plexus block is a minimally invasive injection procedure that diagnoses and reduces abdominal pain from pancreatitis or cancer. The purpose of the procedure is to block nerves surrounding the abdomen that are causing chronic pain. Patients lie on their stomach during the procedure while a needle is inserted into the celiac plexus nerves. An x-ray and contrast dye solution may be used to determine the location of the celiac plexus nerves. An anesthetic medicine is then injected to provide the patient with immediate pain relief.