Merck Manual

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What Happens When the Prostate Gland Enlarges?
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What Happens When the Prostate Gland Enlarges?

    In benign prostatic hyperplasia, the prostate gland enlarges. Normally the size of a walnut, the prostate gland may become as large as a tennis ball. The enlarging prostate gland squeezes the urethra, which carries urine out of the body. As a result, urine may flow through more slowly, or less urine may flow through.