Understanding Blood Pressure: What Your Numbers Mean
Learn how to read your blood pressure, understand healthy ranges, and manage hypertension.
High blood pressure (hypertension) affects nearly 1 in 4 Canadian adults and is a leading risk factor for heart disease and stroke. Understanding your blood pressure numbers is the first step to protecting your heart health.
What Do the Numbers Mean?
Blood pressure is measured in millimeters of mercury (mmHg) and recorded as two numbers:
Systolic (Top Number)
Pressure when your heart beats and pumps blood
Diastolic (Bottom Number)
Pressure when your heart rests between beats
Blood Pressure Categories
According to Hypertension Canada guidelines:
Normal
Healthy blood pressure
Elevated
Risk of developing hypertension
High (Stage 1)
Hypertension - lifestyle changes needed
High (Stage 2)
Hypertension - medication often needed
Why High Blood Pressure Matters
High blood pressure is called thesilent killer" because it often has no symptoms. Over time, it damages blood vessels and organs:
- Heart disease " Increased risk of heart attack and heart failure
- Stroke " Leading cause of stroke in Canada
- Kidney damage " Can lead to kidney disease or failure
- Vision loss " Damages blood vessels in the eyes
- Cognitive decline " Linked to dementia and memory problems
Risk Factors for High Blood Pressure
Modifiable (You Can Change)
- • Unhealthy diet (high sodium, low potassium)
- • Physical inactivity
- • Being overweight or obese
- • Excessive alcohol consumption
- • Smoking
- • Chronic stress
- • Poor sleep
Non-Modifiable
- • Age (risk increases with age)
- • Family history of hypertension
- • Ethnicity (higher in Black, South Asian populations)
- • Chronic kidney disease
- • Diabetes
Lifestyle Changes to Lower Blood Pressure
These evidence-based strategies can significantly reduce blood pressure:
DASH Diet
Rich in fruits, vegetables, whole grains, and low-fat dairy. Reduces sodium to less than 2,300mg/day (ideally 1,500mg). Can lower systolic BP by 8-14 mmHg.
Regular Exercise
150 minutes of moderate aerobic activity per week. Can lower systolic BP by 4-9 mmHg.
Weight Management
Losing even 5-10% of body weight can significantly reduce blood pressure.
Limit Alcohol
No more than 2 drinks/day for men, 1 drink/day for women. Can lower systolic BP by 2-4 mmHg.
Quit Smoking
Smoking raises blood pressure and damages blood vessels. Quitting improves heart health within weeks.
Measuring Blood Pressure at Home
Home monitoring is recommended for accurate readings. Tips for accurate measurement:
- Use a validated upper arm monitor (not wrist)
- Sit quietly for 5 minutes before measuring
- Sit with back supported, feet flat on floor
- Place arm on a flat surface at heart level
- Don't talk during measurement
- Take 2-3 readings, 1 minute apart
- Avoid caffeine, exercise, and smoking 30 minutes before
- Measure at the same time each day
When to Seek Immediate Care
If your blood pressure is above 180/120 mmHg and you have symptoms like chest pain, shortness of breath, severe headache, or vision changes, seek emergency care immediately. This is a hypertensive crisis.
Sources: Hypertension Canada, Heart & Stroke Foundation of Canada, Public Health Agency of Canada. Guidelines current as of January 2026.
Concerned About Your Blood Pressure?
Our physicians can review your readings, discuss lifestyle changes, and determine if medication is needed.
Book a Consultation