Study Finds Hidden High Blood Pressure in 59% of Cases

A large study of adults in England found that high blood pressure often goes unnoticed. Researchers examined data from 1.4 million people and classified 37% as having hypertension. Among that group, nearly 59% were unaware of it. The likelihood increased with age and was especially pronounced among men with higher body mass indexes.

High blood pressure may not cause noticeable symptoms, and problems such as headaches, dizziness, or anxiety can have many explanations. The study also found that slightly more than half of participants taking blood-pressure medicine still did not have their readings under control. Researchers defined hypertension as a top reading of at least 140 or a bottom reading of at least 90, or reported use of prescription medication.

The concern is long-term strain on the heart and blood vessels. Persistently elevated pressure can contribute to heart disease and serious problems involving the brain, kidneys, eyesight, and major arteries. The findings also point to the importance of accurate measurement, since readings taken at home or in a medical office can be misleading when equipment or technique is off.