How does anesthesia work?

Anesthesia is the use of medicines to prevent pain during surgery and medical procedures, and it comes in several forms. Local anesthesia numbs a small area by temporarily blocking the nerves there from sending pain signals to the brain, which is how a dentist numbs a tooth. Regional anesthesia, such as an epidural, blocks pain in a larger region of the body. General anesthesia, used for major surgery, puts the patient into a controlled, reversible state of unconsciousness in which they are unaware and feel nothing. It works through drugs that act on the brain and nervous system to suppress consciousness, memory, and the perception of pain. Interestingly, scientists still do not fully understand exactly how general anesthetics produce unconsciousness. An anesthesiologist carefully monitors and adjusts the drugs and the patient vital signs throughout the procedure to keep them safe.