Is your blood pressure "normal" at the doctor's office? Are you reassured by those readings? Well, not so fast. There's a type of high blood pressure that's hard to detect called "masked hypertension." It's a dangerous type of high blood pressure that can lead to sudden death. In order to unmask "masked hypertension," we need to measure our blood pressure at home. Home blood pressure monitoring is widespread in Japan and is easier than you think. Find out how to use a home blood pressure monitor to get a true reading.