Prostate cancer refers to formation of malignant cells in the prostate gland. Initially, the cancer is limited to the prostate tissue; over time, however, the tumor can spread (metastasize) into other parts of the body (bones, lymph nodes, rectum, and bladder) to form new cancers. This condition is called metastatic prostate cancer. In general, prognosis of a cancer spreads outside the prostate gland is worse than a cancer confined to the prostate gland. In other words, you have low chance to survive if you are diagnosed with metastatic prostate cancer.
Unlike many types of cancer, prostate cancer often progresses slowly without causing any symptoms that can impact your daily activities. In fact, you can live with prostate cancer for years without knowing it. Over time, however, as the tumor increases in size, its presence becomes impossible to ignore: it causes physiological problems: pain, difficulty in urinating, erectile dysfunction, and more.
Prostate is a gland of the male reproductive system. It is located under the bladder, at the confluence of the genital and urinary passage. The prostate is traversed by the first portion of the urethra and incompletely surrounded by the striated sphincter. Its role is to secrete and store the seminal fluid. The prostate gland is about the size of a walnut when it is healthy. As you get older, however, the prostate gland grows accordingly; it does not mean you have a prostate problem. For example, the prostate gland is very small at birth, while it can reach up to 25 g in adulthood.