During surgery, you will be administered some form of anesthesia. The anesthetic technique used for your surgery depends on both the procedure being performed and your medical history. Your anesthesiologist will help you decide which technique is best for you.
Below are three major types of anesthesia:
General Anesthesia – This causes you to be unconscious for the entire procedure. You will be completely unaware and will feel no pain during the surgery. The medication is given into a vein (intravenously) or inhaled. A breathing tube may be inserted into the windpipe to maintain proper breathing during surgery.Regional Anesthesia – This involves injecting a local anesthetic (numbing medication) around major nerves or the spinal cord to block pain signals. You are usually also given sedative medication into a vein for relaxation.

There are two types of Regional Anesthesia: Spinal or epidural anesthesia – The numbing medication is injected around the spinal cord and blocks pain signals from the entire region of the body. This is often used for leg, lower abdominal, gynecological and rectal procedures.Peripheral nerve blocks – The numbing medication is injected near major nerve groups to specific areas, i.e., the arm, hand or leg. This blocks the pain signals from that area.Local Anesthesia – The numbing medication is injected directly into the surgical site to temporarily block pain sensations from a particular area. A sedative medication may be administered for relaxation.References: