The prostate is part of a man's reproductive system. It's an organ located in front of the rectum and under the bladder. The prostate surrounds the urethra, the tube through which urine flows.
A healthy prostate is about the size of a walnut. If the prostate grows too large, it squeezes the urethra. This may slow or stop the flow of urine from the bladder to the penis.
Prostate cancer is a malignant (cancerous) tumor (growth) that consists of cells from the prostate gland. The tumor usually grows slowly and remains confined to the gland for many years.
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