How does benign prostatic hyperplasia (BPH) cause urinary symptoms?

Benign prostatic hyperplasia (BPH) is the abnormal growth of benign prostate cells. In BPH, the prostate grows larger and puts pressure on the urethra and bladder, blocking the normal flow of urine. This causes the flow of urine to weaken, the need to get up in the night to urinate more often, and eventually even the inability to go. More than one-half the men in the United States between the ages of 60 and 70 and as many as 90% between the ages of 70 and 90 have some urinary symptoms resulting from an enlarged prostate.

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