Anesthesia or anesthesia (from the Greek "without hearing") is a condition of control, temporary loss of emotion or awareness caused by medical purposes. It may include some or all of the analgesia (relief from or blocking pain), paralysis (muscle relaxation), amnesia (memory loss), and unconsciousness. A patient under the effects of anesthetics is said to be inactive. Anesthesia enables the efficacy of pain in medical procedures that would make it painful or unbearable for an inaccessible patient, even if otherwise mentally inaccessible. Three broad categories of anesthesia exist: General anesthesia compresses the function of the nervous system and leads to unconsciousness and complete loss of sensation, using damaged or implanted drugs. Sedation suppresses the central nervous system to a lesser degree, preventing anxiety and building long-term memories without resulting in unconsciousness.

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