Transurethral resection of the prostate is currently the main treatment for prostate hyperplasia, the surgery is minimally invasive, effective, and is recognized worldwide as the gold standard for the treatment of prostate hyperplasia, so that a large number of patients benefit from it. However, some patients reflect that after the surgery, they can urinate smoothly at the beginning, but after half a month, their urine is getting thinner and thinner, and the time of urination is prolonged, and they can’t even urinate! Why? Transurethral resection of prostate belongs to a kind of minimally invasive surgery, the surgery does not need to open the abdomen surgery, only through the urethra for surgery, anesthesia during the operation, no pain, and postoperative recovery is also very fast. Because it is so minimally invasive, it can be performed safely on many elderly patients, with the oldest patient I have operated on reaching 94 years of age. However, because the surgery is performed through the urethra, a small number of patients may experience minor urethral injuries that can lead to postoperative urethral adhesions and strictures. The external urethra is the narrowest part of the male urethra. When minimally invasive surgery is performed through the urethra, there is a possibility of epidermal abrasion of the external urethra, and an inflammatory response to the indwelling catheter in the postoperative period, which may lead to postoperative adhesion of the urethral opening and thinning of the urethral line in a small number of patients. This situation can be resolved in a few minutes with prompt and simple urethral dilatation. However, if the delay is too long and a hard scar forms in the adherent urethra, further surgical treatment is required. Therefore, patients should pay attention to urination after the operation and go to the hospital in time when a thin urine stream occurs.