What is the prostate gland? The prostate is an organ that is under the bladder and surrounds the urethra. It puts out a chemical that is put into the ejaculate. Only men have a prostate. The prostate causes problems as men get older. Over time the prostate swells. There is a difference between this benign process and cancer. With the benign process the inner portion swells naturally and it swells in. This compresses the tube and makes harder to urinate and stream is less powerful. It is uncomfortable and treatable but it is nothing that will cause long term problems.