Disorders of the prostate gland that can cause voiding symptoms and sexual dysfunction. The three most common diseases are prostatitis, benign prostatic hyperplasia, and prostate cancer. Prostatitis is an inflammatory condition of the gland, causing a variety of voiding symptoms and pain in the area around the prostate. Benign prostatic hyperplasia is a benign growth of the inner portion of the gland that causes progressive obstruction of the urinary channel (urethra) at the base of the bladder. Prostate cancer is the most common nonskin malignancy in men and is a major health concern for the aging population.