For a largely unobservable gland few of us will ever see, and many of us never think about, the prostate can cause a lot of trouble.

If you live long enough, you're pretty much guaranteed to suffer from an enlarged prostate—90 percent of men older than age 80 have one—along with all the urinary problems that go with it. That's not even to mention the looming specter of prostate cancer, the second most common type in men behind only skin cancer. Nearly a quarter of a million new cases are diagnosed each year in the United States alone.

Then there's prostatitis, the inflammation and swelling of the prostate gland. Prostatitis is the most common urinary tract issue for men younger than 50 and the third most common one for older men, accounting for 2