Clearly the focus of regional anesthesia is on peripheral nerve and plexus injections for short term anesthesia of 6-24 hours, extended to 2-3 days with catheters. The focus of pain medicine is to provide long term relief without anesthesia through injections of joints and the epidural space, the use of neuroablative procedures (RF neurotomy, chemoneurotomy, cryoneurotomy), neuromodification procedures (Pulsed RF), and neuromodulation (spinal cord stimulation, peripheral nerve stimulation, intrathecal pump infusion). Pain physicians also use a variety of oral and topical medications, something not typically employed in regional anesthesia. US use by pain physicians is frequently for diagnostic musculoskeletal evaluation and for guided injections into tendons, joints, and only less frequently nerves. Pain physicians would only very rarely (if at all) perform any brachial plexus, popliteal, adductor, femoral, sciatic, ankle, TAP, pec 1 or pec 2 blocks, whereas these are much more commonly used in regional anesthesia. Pain physicians may employ celiac plexus, stellate ganglion, lumbar sympathetic, splanchnic nerve blocks, vertebroplasty, and intradiscal procedures/disc decompression procedures: all things rarely (if ever) performed by regional anesthesia trained docs. Pain physicians are office based. Regional anesthesia physicians are usually hospital or surgery center based. The clienteles are quite different with pain physicians dealing with chronic pain psychopathologies on a daily basis whereas regional anesthesia docs rarely address these issues. Most regional anesthesia docs are highly proficient at what they do- only some pain docs are highly proficient. Pain docs may come from any background specialty since the ACGME pain fellowships are open to anyone from any residency training program. Many pain docs were "grandfathered" through 1998 in anesthesia, and through 2003-6 in physiatry/neurology never having done a fellowship at all, and were given the same ACGME "additional qualifications in pain medicine" as a fellowship trained doc. Many pain docs have neither ACGME pain boards nor a fellowship. However over the past 5-10 years, most entering pain medicine have an ACGME fellowship. Regional pain fellowship trained physicians are 100% from an anesthesiology background residency, although the fellowship is not ACGME sanctioned, and the ABMS does not recognize the fellowship training.