A lumbar sympathetic block is traditionally used to treat chronic lower extremity pain that has a sympathetic component. This includes conditions such as complex regional pain syndromes (CRPS) within the legs, peripheral vascular diseases, phantom limb pain, cancer pains, and Raynaud’s phenomenon. A lumbar sympathetic block is an outpatient procedure that involves injecting local anesthetic +/- steroid, near the sympathetic nerves located in the lower back (lumbar region). These sympathetic nerves lay just in front of the vertebral spine and are located using fluoroscopy (low dose x-ray). The injection of local anesthetic inhibits their transmission, thereby decreasing the pain signals.