Prostate cancer develops in the prostate gland and common symptoms include trouble urinating, blood in urine or semen, and swelling in legs. Risk factors include age over 50, family history, diet high in animal fat, and African American ethnicity. It is treated through chemotherapy, cryotherapy, hormone therapy, and screening to detect early. Men can do self-exams starting at age 40 and reducing risk involves frequent ejaculation, not smoking, exercise, and eating tomatoes and foods low in fat.