Local anesthesia is an anesthetic technique that blocks cortical nerve conduction in the surgical area with anesthetic drugs. It has little interference with systemic functions, so that the indications for surgery are expanded, and it is also applicable to patients who cannot tolerate surgery and anesthesia, such as chronic cough, prostatic hyperplasia, cirrhosis of the liver with ascites, advanced age or with cardiovascular disease, etc. It has a positive effect on the prevention of complications and postoperative recurrence. The advantages of local anesthesia: ① local anesthesia is less risky than epidural anesthesia and general anesthesia, with fewer complications and a greater safety factor; ② preoperative and postoperative eating is not affected, and you can get out of bed after surgery; ③ the main postoperative complication of urinary retention is significantly reduced; ④ it helps to shorten the hospital stay and save hospitalization costs.