There is no specific cause for this condition. It just sometimes happens as you get older. Since only men have this condition. The single big risk factor is age, the older you are, the more likely you are to suffer from it. It is likely to start before the age of 45. Benign prostatic hypertrophy is swelling of this gland because the prostate surrounds the urethra, so when it swells it can block the flow of urine. The urine stream gets slow. Frequent urination, cannot hold the urine, getting up several times in the night to pass urine. Sometimes have to rush to the toilet to pass the urine, as the patient might feel as the urine may escape. However, patient have to wait for sometime for the stream to come. Dribbling at the end of the stream. It can sometimes cause urine infection, which can cause intense burning and stinging on passing the urine.