Elderly people who cannot urinate need to go to the hospital for examination to clarify the cause and then treat it symptomatically: 1. Urinary retention caused by prostatic hyperplasia, seen in elderly men, is the most common cause of difficulty in urination. It is recommended to temporarily give indwelling catheter treatment to first lead the urine in the bladder out of the body through the catheter to reduce the patient’s pain. Then, depending on the degree of prostate enlargement, the treatment of surgery, cystostomy or long-term catheterization can be chosen. After the diagnosis of this condition is confirmed, inpatient surgery is required. Removal of the tumor lesion in the body and removal of the urinary tract obstruction can restore normal urination.