Do you have low blood pressure? This is how to tell. High blood pressure is sometimes referred to as the “silent killer” by organisations like the British Heart Foundation (BHF), because it rarely has any signs or symptoms. As a result, the BHF says: “Millions of people with high blood pressure don’t even know they have it.” It can eventually lead to heart issues and stroke, which is why it’s important to get your blood pressure checked (especially if you think you might be at risk or are over 40 and haven’t had it looked at in the last five years), the NHS says.But what about low blood pressure?