Local anesthesia does not affect the brain, and anesthesia is divided into general anesthesia and local anesthesia. The concept of local anesthesia is to use local anesthetics such as procaine and lidocaine to be injected into the corresponding parts, such as spinal nerves, nerve plexus and nerve trunks, so that the peripheral nerve endings will be blocked, so that the patient will lose the sensation of a certain part of the body temporarily. The characteristic of local anesthesia is that the anesthesia is only limited to the local part of the body, and the patient is conscious, and the commonly used methods in the clinic include intrathecal anesthesia and nerve block. General anesthesia mainly refers to injecting anesthetics through inhalation or intravenous injection to inhibit the central nervous system, resulting in the loss of consciousness of the patient and the absence of pain sensation around the body. This kind of anesthesia has a certain effect on the patient’s brain, but it is reversible, when the patient’s anesthesia drug is metabolized, the patient can completely return to normal.