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Why Blood Pressure Differs Between Arms & Heart Risks

BP Readings

Why Blood Pressure Differs Between Arms & What It Means for Your Heart


Is your blood pressure different in each arm? Learn what a gap in BP readings means for your heart health and how to measure your blood pressure accurately.

Checking your blood pressure (BP) is a vital part of staying healthy. Most people only use one arm when they take a measurement. However, your blood pressure can actually vary between your right and left arms. While a small difference is usually fine, a large gap can be a warning sign for your heart.

Understanding why these readings differ—and how to track them—can help you catch heart or artery problems early.

Why Do Readings Differ Between Arms?

There are three main reasons why your BP numbers might not match.

1. Natural Body Differences

Our bodies are not perfectly symmetrical. Small differences of up to 5 mmHg are normal. This happens because of variations in muscle mass, how elastic your blood vessels are, or simply which arm you use more often.

2. Underlying Health Conditions

If the difference between your arms is 10 to 15 mmHg or more, it could point to a health issue. Common causes include:

  • Peripheral Artery Disease (PAD): A narrowing of the arteries in one arm.

  • Blocked Arteries: Plaque buildup can restrict blood flow on one side of the body.

  • Diabetes: People with Type-2 diabetes often show a wider gap between arm readings.

3. Simple Measurement Errors

Sometimes the "risk" is just a mistake in how the test was done. If your arm is dangling by your side instead of resting on a table, your top number (systolic) can rise by over 6 mmHg. Using a cuff that is too tight or too loose will also cause a false reading.

What Is a "Safe" Difference?


Use this simple guide to understand your numbers:

BP DifferenceRisk LevelAction Needed
0–5 mmHgNormalNo concern
5–10 mmHgLowMonitor regularly
10–15 mmHgModerateConsult a doctor
Over 15 mmHgHighSeek medical help immediately

How to Measure Your Blood Pressure Correctly

To get the most accurate results, you must follow a specific routine. Even small distractions can change your blood pressure.

Preparation is Key

Before you start, sit quietly for at least five minutes. Avoid caffeine, smoking, or heavy exercise for 30 minutes before the test. Make sure the room is quiet and you feel relaxed.

The Correct Position

  • Arm Placement: Rest your arm on a flat table so it is at the same level as your heart.

  • Sitting Posture: Sit in a chair with your back supported and your feet flat on the floor. Do not cross your legs.

  • Cuff Placement: Put the cuff on bare skin, not over a sleeve.

The Risks of Ignoring Uneven BP

If you consistently see a large difference between your arms, do not ignore it. Studies show that a significant gap is linked to a higher risk of:

  • Heart Attack and Stroke: Uneven pressure often means the heart is working harder or blood flow is restricted.

  • Vascular Disease: Narrowing of the arteries can lead to poor circulation in the limbs.

  • Kidney Issues: Chronic high blood pressure can damage the small vessels in your kidneys over time.

Simple Habits for Healthy Blood Pressure

You can manage your BP and keep your arteries healthy with these daily habits:

  1. Lower Your Salt Intake: Too much sodium makes your body hold water, which raises pressure.

  2. Stay Active: Aim for 30 minutes of walking or light exercise most days.

  3. Manage Stress: Practice deep breathing for 10 minutes a day to calm your nervous system.

  4. Track Both Arms: At least once a month, check both arms to ensure the gap isn't growing.

Frequently Asked Questions


Why is my BP different in my left arm vs. my right?

Small variations are natural due to your anatomy. However, a difference over 10 mmHg may suggest a blockage or narrowing in an artery.

Should I always check both arms?

Doctors recommend checking both arms during your first few measurements. Once you know which arm has the higher reading, you can use that arm for your daily tracking.

What should I do if the difference is very high?

If the gap is consistently over 15 mmHg, schedule an appointment with a doctor or cardiologist. They may want to check your arteries for signs of plaque or other vascular issues.

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