Anesthesiology is a branch of medical science dealing with drugs or agents that make you insensible to pain. Doctors who deal with anesthesia are known as anesthesiologists. There are several options for anesthesia for patients undergoing surgery. These include local anesthesia, regional anesthesia, or general anesthesia. The type of anesthesia used depends on the nature and duration of the surgery, patient’s health and medical conditions, and preferences of the patient, surgeon, and anesthesiologist.