Commonly used local anesthesia methods include surface anesthesia, local infiltration anesthesia, regional block anesthesia, and nerve block anesthesia. Surface anesthesia is the application of local anesthetic to the mucosal surface, and there are various methods of administration, such as drops for the eye, application for the nasal cavity, spray for the throat and trachea, and irrigation for the urethra. Local infiltration anesthesia is administered by injecting local anesthetic into the surgical site and blocking the tissue nerve endings in layers to produce anesthesia, which is mainly suitable for short operations on the body surface. Regional block anesthesia is administered by injecting local anesthetic around and at the base of the surgical area to block the conduction of nerve endings in the area, such as local mass removal. Nerve block anesthesia is administered by injecting a local anesthetic into the nerve trunk, plexus, or parasympathetic ganglion to temporarily block the nerve conduction pathway in that area, causing anesthesia in the area innervated by that nerve. This type of anesthesia requires the involvement of an anesthesiologist and is no longer narrowly classified as a method of local anesthesia.