Basics About the Prostate

Often described as a walnut or chestnut-shaped organ, the prostate is a gland that surrounds the beginning of the urethra. The prostate produces a milky fluid that provides nutrient to the sperm and is discharged into the urethra at the time of semen emission.

An organ exclusive to men, the development of the prostate is spurred by male hormones (especially testosterone). The rate of prostate growth decreases and may stop around age 20. A second growth period often occurs around age 45, as cells in the middle of the prostate start to reproduce more rapidly than normal. This growth may result in BPH or enlarged prostate.

Additional information:

• Learn how the prostate works, including its role in reproduction and the urinary system.
• What you need to know to maintain good prostate health.
• Read about three major prostate diseases — BPH or enlarged prostate,
  prostate cancer, and prostatitis.