Blood pressure is checked so routinely at doctor visits that it's easy to forget how consequential the numbers are. Yet the Centers for Disease Control estimates that nearly 48 percent of American adults have hypertension — and many have no idea.
High blood pressure is called the "silent killer" because it causes no symptoms while quietly damaging the heart, arteries, kidneys, and brain over years or decades.
What the Numbers Mean
Blood pressure is written as two numbers — for example, 120/80. The top number (systolic) is the pressure when your heart beats. The bottom (diastolic) is the pressure between beats.
- Normal: Below 120/80
- Elevated: 120–129 / below 80
- Stage 1 High: 130–139 / 80–89
- Stage 2 High: 140+ / 90+
- Crisis — call 911: Above 180 / above 120
Why It Matters
Unmanaged high blood pressure strains artery walls, forces the heart to work harder, and raises the risk of heart attack, stroke, kidney failure, and dementia. These risks climb significantly with age.
Risk Factors
Factors you can change: high-sodium diet, physical inactivity, excess weight, heavy alcohol use, smoking, and chronic stress.
Factors you cannot change: age (risk rises sharply after 55), family history, and certain chronic conditions like diabetes.
The Symptom Problem
Most people with high blood pressure feel perfectly fine. Symptoms — sudden severe headache, blurred vision, chest pain, confusion — typically signal a dangerous crisis. If any of those occur, call 911 immediately.
What You Can Do
Get your blood pressure checked. Pharmacies offer free readings at in-store kiosks. Home monitors are inexpensive and accurate. If your numbers are elevated, talk to your doctor — lifestyle changes alone often help, and medications are effective when needed.