High blood pressure (hypertension) affects roughly 1.3 billion people worldwide and is the leading modifiable risk factor for cardiovascular disease, stroke, and kidney failure. Yet it is called the "silent killer" for good reason — it produces no symptoms in most people until serious damage has occurred. Understanding how to manage it is one of the highest-leverage health investments most adults can make.
Understanding Blood Pressure Numbers
Blood pressure is measured as two numbers: systolic (pressure when the heart beats) over diastolic (pressure between beats), expressed in millimeters of mercury (mmHg). Current guidelines from the American College of Cardiology:
- Normal: Less than 120/80 mmHg
- Elevated: 120-129 systolic, less than 80 diastolic
- Stage 1 hypertension: 130-139/80-89 mmHg
- Stage 2 hypertension: 140/90 mmHg or higher
- Hypertensive crisis: Higher than 180/120 mmHg — requires immediate medical attention
A single elevated reading does not diagnose hypertension. Blood pressure varies throughout the day and is affected by stress, caffeine, exercise, and even the act of having it measured ("white coat hypertension"). Diagnosis requires multiple readings over time, ideally including home measurements.
Lifestyle Interventions: The Foundation
Dietary Sodium Reduction
Sodium is the most evidence-backed dietary target for blood pressure reduction. The DASH-Sodium trial found that reducing sodium from 3,300mg to 1,500mg daily reduced systolic blood pressure by 8.9 mmHg in people with hypertension — comparable to a single medication. The average American consumes 3,400mg of sodium daily; the recommended limit is 2,300mg, with 1,500mg as the optimal target for people with hypertension.
Roughly 70% of dietary sodium comes from processed and restaurant foods, not the salt shaker. The most impactful changes are reducing processed meats, canned soups, bread, and restaurant meals — not just avoiding added salt at the table.
The DASH Diet
The Dietary Approaches to Stop Hypertension (DASH) diet is the most evidence-backed dietary pattern for blood pressure management. It emphasizes fruits, vegetables, whole grains, lean protein, and low-fat dairy while limiting saturated fat, sodium, and added sugar. Following DASH reduces systolic blood pressure by 8-14 mmHg in people with hypertension — as much as many medications.
Exercise
Regular aerobic exercise reduces resting blood pressure by 5-8 mmHg systolic. The effect is dose-dependent — more exercise produces greater reductions, up to a point. 150 minutes per week of moderate-intensity aerobic exercise is the minimum effective dose. Resistance training provides additional modest benefits. Exercise also reduces cardiovascular risk through mechanisms beyond blood pressure, making it doubly valuable.
Weight Loss
Blood pressure rises approximately 1 mmHg for every kilogram of weight gained. Conversely, losing 5kg reduces systolic blood pressure by roughly 4-5 mmHg. For overweight individuals with hypertension, weight loss is often the single most impactful intervention available.
Alcohol Reduction
Alcohol raises blood pressure in a dose-dependent manner above two drinks per day. Reducing from heavy drinking to moderate drinking reduces systolic blood pressure by 5-6 mmHg. For people with hypertension, the safest approach is minimal alcohol consumption.
Medication: When and What
Lifestyle changes are first-line treatment for Stage 1 hypertension without cardiovascular risk factors. For Stage 2 hypertension, or Stage 1 with high cardiovascular risk, medication is typically recommended alongside lifestyle changes. The major medication classes:
- ACE inhibitors / ARBs: First-line for most patients, particularly those with diabetes or kidney disease. Protect kidneys and reduce cardiovascular events beyond blood pressure lowering.
- Calcium channel blockers: Effective and well-tolerated; particularly useful in older patients and those of African descent
- Thiazide diuretics: Inexpensive, effective, and recommended as first-line in many guidelines. Chlorthalidone has stronger evidence than hydrochlorothiazide.
- Beta-blockers: Less preferred as first-line unless there is a specific indication (heart failure, post-MI, atrial fibrillation)
Home Monitoring
Home blood pressure monitoring is now recommended as standard practice for anyone with hypertension or elevated readings. It provides more accurate data than office measurements, detects white coat and masked hypertension, and improves medication adherence. Measure in the morning before medication and in the evening, after sitting quietly for five minutes. Record readings and share with your healthcare provider.