Controlling high blood pressure is a good thing—unless you are a frail older person. Then it might be harmful. That’s the surprising finding of a study of more than 2,000 seniors published online in the Archives of Internal Medicine. Make no mistake: high blood pressure is a definite health hazard. It damages arteries in the heart, kidneys, and throughout the body, leading to heart attack, heart failure, stroke, kidney failure, and other serious health problems. That’s why ma