Anesthesia is a word derived from the Greek, meaning ''without sensation''. Anesthesia is used in surgery to minimize pain, discomfort, and shock for surgical patients. There are several types of anesthesia which can be used depending on the needs of the surgery: general, local, regional, and conscious sedation. When anesthesia works as expected, the patient feels no pain during a procedure, and often does not remember the proceedings either. Anesthesia increases patient comfort, which can in turn reduce recovery times. With the knowledge that they are not inflicting pain, it also makes it easier for a medical staff to work.