Why wouldn't you want to be screened to see if you're at risk for cancer, heart disease, or another potentially lethal condition? After all, better safe than sorry. Right? Not so fast, says Alan Cassels. His "Seeking Sickness" takes us inside the world of medical screening, where well-meaning practitioners and a profit-motivated industry offer to save our lives by exploiting our fears. He writes that promoters of screening overpromise on its benefits and downplay its harms, which can range from the merely annoying to the life threatening. If you're facing a screening test for breast or prostate cancer, high cholesterol, or low testosterone, someone is about to turn you into a patient. You need to ask yourself one simple question: "Am I ready for all the things that could go wrong?