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. Und...
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