It's a number we often hear at doctor's appointments, sometimes even see on those little home monitors: blood pressure. But what does it actually tell us? Think of your blood pressure as the force your blood exerts as it travels through your arteries, keeping everything in your body supplied with vital oxygen and nutrients. It's a constant, dynamic process, powered by the rhythmic beat of your heart.
When we talk about blood pressure readings, you'll typically see two main numbers. The first, the systolic pressure (often labeled 'SYS'), is the pressure in your arteries when your heart pumps blood out. It's the peak pressure. The second number, the diastolic pressure ('DIA'), is the pressure when your heart rests between beats. This is the lower, resting pressure. You might also see a 'PULSE' reading, which is simply your heart rate – how many times your heart beats per minute.
So, what's considered 'normal'? For adults 18 and older, the general consensus is that a blood pressure reading below 120/70 mmHg (millimetres of mercury) is ideal. This applies whether it's measured at home or in a doctor's office. This range signifies that your heart and blood vessels are working efficiently without undue strain.
Things start to shift when we look at 'elevated' blood pressure. This is typically a systolic reading between 120-134 mmHg and a diastolic reading between 70-84 mmHg. It's not yet hypertension, but it's a signal that things are trending higher and might warrant attention. Then there's hypertension, or high blood pressure, which is generally considered to be 135/85 mmHg or higher in a doctor's office, or 140/90 mmHg if you're looking at home readings. Consistently high blood pressure means your blood is pushing too hard against your artery walls, which over time can seriously strain your heart and damage your blood vessels, increasing the risk of heart disease, stroke, and other serious health issues.
Interestingly, high blood pressure is often called a 'silent' condition because it rarely shows obvious symptoms. Sometimes, though, people might experience headaches, dizziness, chest pain, palpitations, or even nosebleeds. Many discover they have it during routine check-ups, which is why regular monitoring is so crucial.
What about the other end of the spectrum? Hypotension, or low blood pressure, means your blood is moving through your arteries with less force than usual. A reading below 90/60 mmHg is generally considered low. For some people, this might be perfectly normal and cause no issues, especially if they feel well. However, if you do experience symptoms like dizziness, light-headedness, fainting, blurred vision, nausea, fatigue, or difficulty concentrating, it's worth discussing with a healthcare professional.
Causes for low blood pressure can range from simple things like dehydration or long gaps between meals to more complex factors like certain medications, prolonged bed rest, or medical conditions such as diabetes. Pregnancy can also lead to lower blood pressure.
Whether your blood pressure is high or low, understanding it is a vital step in managing your overall health. Making lifestyle changes – like moderating salt intake, eating a balanced diet rich in fruits and vegetables, managing stress, getting enough sleep, exercising regularly, maintaining a healthy weight, and avoiding smoking and excessive alcohol – can make a significant difference. And of course, if lifestyle adjustments aren't enough, your doctor can discuss other options, including medication.
