Men who can’t urinate after 3 days of bladder perfusion may have urethral edema or blood clots in the urethra due to perfusion, so it is recommended to go to the hospital for further examination and timely treatment. Clinical bladder perfusion needs to be strictly regulated operation, if due to the perfusion operation is not standardized, may lead to the operation process of scratching the urethra and the emergence of urinary tract infection, the above may cause urethral edema, which appeared after the bladder perfusion of urinary obstruction performance. In addition, if the urethra and bladder bleed due to drug stimulation or instrument scratches during instillation, blood clots may form after a period of time, and clots blocked in the urethra may also cause dysuria. Therefore, it is recommended to go to the hospital in time for further examination to clarify the cause of the disease and deal with it in time.