The level for having a stroke or heart attack differs from person to person. You can have a stroke with normal blood pressure and you can have a heart attack with normal blood pressure. But knowing your blood pressure at least serves as a guidepost. We normally say your blood pressure should be 120/80, and increasingly we believe that it should never be higher than that—keeping it a little lower is a good idea. Buying a blood pressure kit and keeping it at home could be one of the best investments for you. They’re very inexpensive. You can take your blood pressure, check for any variations and let your doctor know about them.