Most cancers are easier to treat when they are found in their earlier stages and screening tests can often detect cancer before symptoms develop.
Screening for prostate cancer is something you should discuss with your doctor. Some experts don't recommend screening, because it's not clear whether early detection improves quality of life or survival. The U.S. Preventive Services Task Force (USPSTF), for instance, doesn't recommend for or against screening for prostate cancer.
The American Cancer Society does believe that screening for prostate cancer is important, particularly for men at high risk.