Prostate cancer is a cancer that develops from the cells lining the duct structure of the prostate. The prostate is a walnut-sized gland that is a part of a man's reproductive system. The prostate is located in front of the rectum and under the bladder. It surrounds the urethra, the tube through which urine flows, and makes part of the seminal fluid. During ejaculation, the seminal fluid helps carry sperm out of the man’s body as part of semen. As men age, the prostate tends to increase in size. If the prostate grows too large, it squeezes the urethra which may narrow and decrease urine flow.
Medical experts do not know what causes prostate cancer or how to prevent it. However, research has shown that men with certain risk factors are more likely than others to develop prostate cancer.
Page last updated: April 12, 2017