Anesthesia is a controlled medical state characterized by the temporary loss of sensation or awareness, induced primarily to facilitate painless surgical or diagnostic procedures. It is distinct from sleep in that the anesthetized brain does not respond to pain signals or normal reflexes. Modern practice focuses on the "6 A's": anxiolysis, areflexia, autonomic areflexia, analgesia, amnesia, and anesthesia. Types of Anesthesia

The specific technique used depends on the procedure and patient health:

General Anesthesia for Surgeons - StatPearls - NCBI Bookshelf

: Numbs a large part of the body, such as the lower half, via spinal or epidural injections.

: Renders the patient completely unconscious and unresponsive. It is typically maintained through inhaled gases (like sevoflurane) or intravenous agents (like propofol).

: Provides sedation and pain relief while the patient remains partially conscious and able to breathe independently.