How does an enlarged prostate cause difficulty voiding?
The first thing to realize is that a man’s prostate is surrounded by a capsule, and this capsule plays an important part in the development of prostatism. As a man ages, his prostate increases in size. However, the capsule prevents the prostate from growing outward. Therefore, when the prostate tissue expands, it expands inward, causing a blockage to the flow of urine. If the prostate can be thought of as a doughnut, then the doughnut grows by growing inward, making the hole in the middle of the doughnut smaller and smaller.
