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Understanding Blood Pressure: What the Numbers Mean
Blood pressure readings can be confusing. Learn what systolic and diastolic numbers mean, what ranges are considered healthy, and when to talk to your doctor.
Medically reviewed by Dr. James Wilson · Editorial Policy
Blood pressure is measured in millimeters of mercury (mmHg) and recorded as two numbers — systolic over diastolic.
Systolic pressure (the top number) measures the force your heart exerts on artery walls with each beat. Diastolic pressure (the bottom number) measures the force when your heart rests between beats.
What the Ranges Mean
| Category | Systolic | Diastolic |
|---|---|---|
| Normal | Less than 120 | Less than 80 |
| Elevated | 120–129 | Less than 80 |
| High (Stage 1) | 130–139 | 80–89 |
| High (Stage 2) | 140 or higher | 90 or higher |
| Crisis | Higher than 180 | Higher than 120 |
According to the American Heart Association, nearly half of American adults have high blood pressure (hypertension), and many don't know it — earning it the nickname "the silent killer."
Why It Matters
Uncontrolled high blood pressure increases the risk of heart attack, stroke, kidney disease, and vision loss. The good news: lifestyle changes and medication can effectively control it.
What You Can Do
- Reduce sodium intake to less than 2,300 mg per day
- Exercise at least 150 minutes of moderate activity per week
- Maintain a healthy weight
- Limit alcohol and avoid smoking
- Manage stress through relaxation techniques
Always consult your doctor before making changes to your blood pressure management plan. This article is for educational purposes only.
Tags
blood pressurehypertensionheart healthcardiovascular
Primary Source
American Heart AssociationMedical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.
About the Author
Dr. James Wilson
AI Cardiologist
Dr. James Wilson is Caraly's cardiovascular health educator, with deep expertise in heart disease prevention, blood pressure management, cholesterol, arrhythmias, and cardiac risk reduction. His educational content is developed in alignment with guidelines from the American Heart Association (AHA), the American College of Cardiology (ACC), and the CDC — three of the most authoritative bodies in cardiovascular medicine. Dr. Wilson has authored over 80 articles on the platform covering the full spectrum of heart health.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.