http://www.cancer.gov/cancertopics/factsheet/Detection/early-prostate
This document also available in Spanish
National Cancer Institute, National Institutes of Health
Except for skin cancer, cancer of the prostate is the most common malignancy in American men. This fact sheet answers questions about prostate cancer, including who is at risk for prostate cancer, what are the symptoms of prostate cancer, how reliable are the screening tests for prostate cancer, and more.