Anesthesia
Anesthesia, absence of physical sensation in part or all of the body. The term more commonly refers to a reversible condition that is induced using anesthetic drugs. These drugs may be injected, inhaled, or applied directly to the surface of the body. It is used for surgery , obstetrics , dentistry , or other medical procedures. Induced anesthesia may be local, involving only part of the body, or general, involving lack of sensation in the entire body as well as a loss of consciousness. Localized anesthesia can also be a result of natural causes, such as nerve injury, leprosy, or diabetes. The lack of sensation caused by these conditions is not easily reversible, and patients’ unawareness of pain and other sensations can put them at risk of serious harm. This article focuses on induced anesthesia used in medical procedures.