If difficulty in urination occurs after surgery, patients are generally advised to take a hot water sitz bath first, soaking the anal wound in hot water so that the sphincter can relax quickly. If the sphincter is relaxed, the urination problem can usually be solved quickly. If urination is not possible after medication and physical treatment, then catheterization is required. Therefore, catheterization is still the last step, and you should try to pass urine smoothly through hot compresses, sitz baths, and pain relief. The anal surgery has a certain impact on urination because anal pain increases during anal surgery, especially when a relatively large anal fistula is done, and the anal and urinary muscles are innervated by the sacral 3/4 nerve. The anal pain, due to its association with the nerve, also changes the urinary system, when the pain increases and difficulties in urination can exist. In order to solve the problem of urination, it is best to perfect the pain relief of anal surgery, so that the pain can be reduced and urination can be improved. After anal surgery, the main reason that affects urination is anal spasm, because after the anal stimulation by surgery, the sphincter muscle tends to spasm, and this spasm makes the patient tense, and also makes the urination muscle tense, which can also cause difficulty in urination.