For patients with pain related to their sympathetic nervous system, a lumbar block (also known as a sympathetic block) can diagnose and in some cases relieve pain. This can be properly diagnosed pain in the legs. A lumbar block involves an injection of a local anesthetic into the lower back. From a diagnostic point of view, a lumbar sympathetic block also help in determining if circulation issues can be improved with some diseases. Short-term pain relief will result from the treatment and depending on the patient’s symptoms, long-term relief from the pain may be experienced.