The prostate is a gland found only in men. It is located between the bladder and the urethra (the urine tube in the penis) and sits right on top of the rectum. It is about the size of a walnut and its primary function is to make about 30% of the fluid in semen to help keep sperm alive and healthy for reproduction.
As men get older, the prostate tends to enlarge. As the prostate enlarges, it can compress and obstruct the urethra and can cause problems with urination such as slow stream, getting up at night, and having difficulty getting the urine flow started. This is known as Benign Prostatic Hypertrophy or BPH and is not the same as prostate cancer. In fact, for many men, prostate cancer may not present any symptoms.