Hemorrhoids is a common anal disease, if hemorrhoid surgery, usually do not need to stay catheterized. Because hemorrhoid surgery is often a relatively short time, and the choice of lumbar and hard anesthesia or local infiltration anesthesia, usually do not need to stay catheterized, only in the case of the patient by the pain of postoperative stimulation or anesthesia affects the urinary discharge, only need to stay catheterized temporarily. Temporary catheterization can usually be removed the next day. However, it is worth noting that before removing the urinary catheter must train the bladder function, that is to say, the urinary catheter should be closed intermittently until it is felt that the bladder function is back to normal, and then remove the urinary catheter, which can avoid the second time to go down the urinary catheter again. Therefore, urinary catheter insertion for hemorrhoid surgery is usually left in place for one day.