High blood pressure alarm: Many people don't have these 23 facts on their radar. Hypertension can cause severe damage to the retina and even make you blind.

High blood pressure starts at 140/90 mmHg (see right) Doctors estimate that almost one in three adults now suffers from high blood pressure. Here, top doctors explain how dangerous hypertension really is, how you can detect it and get it under control. We've put together 23 facts about high blood Pressure, including insights that many patients don't realize.