Regional anesthesia is the kind of anesthesia which affects a large part of the body that is used to make a person comfortable during the surgical operation or to relieve postoperative pain. It numbs a larger area of the body such as limb or lower half of the body. Regional anesthetic techniques can be central or peripheral. The central techniques include neuraxial blockade. The peripheral techniques can be further divided into plexus blocks and single nerve blocks. Regional anesthesia may be performed as a single shot or may be administered over a prolonged period with the use of a continuous catheter. It is generally provided by injecting local anesthetics directly in to the veins of an arm (intravenous regional techniques (Bier block). Regional anesthesia is now more common than general anesthesia for Caesarean section procedures. General anesthesia may become necessary even when a surgical procedure is planned with regional anesthesia because most often the technique has a failure rate of 1-10% even in expert hands. The advantages of regional anesthesia over general anesthesia include less post-operative pain and less nausea, a lower incidence of blood clots, less of a stress response by the body and less blood loss. Moreover regional anesthesia is mostly preferred by patients undergoing orthopedic surgeries for the significantly less postoperative pain.