Prostate cancer is a type of cancer that occurs in the prostate gland, which is a small walnut-shaped gland in men that produces seminal fluid. Prostate cancer is one of the most common types of cancer in men, and it typically grows slowly and may not cause any symptoms in its early stages. However, if left untreated, prostate cancer can spread to other parts of the body and become more aggressive. Treatment options for prostate cancer include surgery, radiation therapy, hormone therapy, and chemotherapy.