If you are unable to urinate after 1 month of indwelling urinary catheter, it is recommended to continue indwelling catheterization treatment or perform suprapubic cystostomy treatment, or clarify the cause of the disease and treat the cause. The reason for difficult urinary retention is usually of two kinds: the first is that the prostate hypertrophy compresses the urethra, leading to elevated urethral resistance and inability to urinate. If the prostate enlargement causes urinary retention, the retention of the urinary catheter and the inability to urinate even after the removal of the catheter, it is recommended to perform surgical treatment of prostate enlargement. The surgery removes the enlarged gland and restores the patency of the urethra so that normal urination can be achieved. The second type, bladder dysfunction, i.e. there is no urethral obstruction, but the bladder contraction is weak. After removal of the urethra in such patients, even though the patency of the lower urinary tract is still acceptable, urine still cannot come out because the bladder is unable to contract, so cystostomy is recommended for treatment.