The symptoms of urinary retention caused by prostatic hyperplasia: 1. inability to urinate, the main symptom is poor urination, and is progressively more difficult to urinate, and will eventually lead to the inability to urinate, when the bladder is filled with a large amount of urine can not be discharged urine, often in the case of emergency admission to the hospital, the consultation process is very painful accompanied by a clear sense of holding urine; 2. urine loss, when prostatic hyperplasia occurs urinary retention When the pressure in the bladder is higher than a certain level, it can exceed the closing pressure of the urethra, and involuntary urine loss will occur, often more obvious at night, without any symptoms before the urine loss; 3, pain in the small abdomen, when the prostate enlargement leads to a large amount of urine retention, the bladder bulges after a persistent pain in the small abdomen, which is caused by the pain caused by the bladder filling up with urine and the surface tension rising, and The pain can be constant or progressively worse.