The prostate is a small gland in men, about the size and shape of a walnut. It wraps around the urethra, the tube that carries urine from the bladder out through the tip of the penis. The gland's main function is to make fluid for semen, which transports sperm. During sex, the prostate's fluid is squeezed into the urethra where it combines with the sperm coming from the testicles. This fluid leaves the penis during ejaculation.
Prostate cancer is a malignant tumor that usually starts in the outer part of the prostate.
As the tumor grows, it may spread to the inner part of the prostate and then beyond the gland to other parts of the body. In the early stages, prostate cancer causes no symptoms. As the tumor grows, it may squeeze the urethra, causing urinary problems. The causes of prostate cancer are not known for sure, but some studies suggest that diets high in fat may contribute to the development of the disease. My doctor says my prostate is enlarged.