Cancer begins in your cells. Cells are the building blocks that form you tissues, which in turn make up the organs in you body. Normally, cells grow and divide to form new ones, so they can replace damaged or dead cells. Normally cells “know” when to stop growing and dividing. But cancer cells are different – they no longer “know” when to stop growing and dividing, so they keep building up extra cells, forming a mass or tumor. Although the eact cause of prostate cancer has nto been identified, researchers believe that up to 90% of prostate cancer happens from an alteration of a man's normal genetic code that is not related to his family genes. Age is the most common factor, with more than 65% of prostate cancer cases occurring in men aged 65 and older. Other risk factors include family history, race, and possibly diet. African American men have the highest rate of prostate cancer, while Asian & Native American men have the lowest rates. As the tumor grows, it may spread from the outer part of the prostate ot the inner part of the prostate, eventually putting pressure on the areas such as the urethra. This may block the flow of urine from the bladder and cause other urinary problems, which are usually the first symptoms of prostate cancer. If untreated, prostate cancer can spread from the prostate to the nearby lymph nodes, bones, or other organs. The spread is called metastasis. As a result of a metastasis, many men experience aches and pains in the pelvis, hips, ribs, back ot other bones.