Prostate cancer is a common cancer in men, starting in the prostate gland, which produces seminal fluid. It often grows slowly and may not cause serious harm, but some types are aggressive and can spread quickly. Symptoms include difficulty urinating, blood in the urine, pelvic discomfort, and bone pain. Screening with prostate-specific antigen (PSA) tests and digital rectal exams (DRE) can help detect it early.