The four main types of anesthesia are: General Anesthesia: Induces a reversible loss of consciousness and sensation for the entire body during surgery. Regional Anesthesia: Blocks sensation in a specific region of the body, typically used for surgeries involving limbs or specific areas. Local Anesthesia: Numbs a small and specific area of the body for minor procedures or surgeries. Monitored Anesthesia Care (MAC): Combines local anesthesia with sedation to keep the patient relaxed and comfortable during minor procedures.