For patients who have urinary retention after prostate enlargement surgery, it is possible that the enlargement treatment is not complete or that the gland has undergone enlargement again after a long interval of time after prostate surgery, thus causing difficulty in urination or even urinary retention. It is recommended that patients go to the urology department for an examination to assess the degree of prostate enlargement. The other thing is that urinary retention can also occur due to weak bladder contraction caused by prolonged obstruction after prostate enlargement surgery. Usually, patients with this condition can have their urodynamics checked to assess whether there are any abnormalities in the functional aspects of the bladder. Therefore, when urinary retention occurs after surgery, the patient should first rule out functional bladder problems, and also if there is a long postoperative interval, there is a possibility that the gland may have re-proliferated and a recurrence of the flare-up occurs, and the patient should choose the appropriate treatment after a full evaluation.