If you're a man, there's a gland you should know about. The prostate gland. This unassuming, walnut-sized gland tucked away inside your body just below your bladder, is responsible for some of the most common problems men face as they age, including prostate enlargement, prostatitis and prostate cancer. For more information about prostate disease, or to schedule an appointment with an Einstein urologist , call 1-800-EINSTEIN.