Bupivacaine hydrochloride is a surface anesthetic that is commonly used in clinical practice for anal, rectal, urethral, vaginal, and esophageal intubation procedures. When used for proctoscopy, a small amount of bupivacaine paste is applied around the anus to reduce the patient’s pain and discomfort. It is also commonly used in clinical practice to treat anal fissures. For some patients with severe anal fissures accompanied by severe pain during or after defecation, the use of bupivacaine can effectively reduce the patient’s pain symptoms. It can also be used in patients after local anal surgery. Patients can use it before or after surgery, especially after surgery when the patient is defecating, which can cause pain in the incision. Topical application of bupivacaine before defecation can effectively relieve anal pain during defecation.