What Diastolic Blood Pressure Is Dangerous? Safe Ranges and When to Worry
Blood pressure is measured with two numbers: systolic (top number) and diastolic (bottom number). Diastolic blood pressure is the pressure in arteries when the heart rests between beats. This number reflects blood vessel resistance and directly influences the risk of heart and kidney disease.
Reference ranges
* Reference values only. Consult a doctor for personalized advice.
High diastolic blood pressure — what are the risks?
Chronically high diastolic blood pressure (≥ 90 mmHg) damages blood vessels, increases cardiac and kidney workload. It is an independent risk factor for coronary artery disease, heart failure, stroke, and chronic kidney disease. Notably, in people under 50, elevated diastolic BP is a better cardiovascular risk predictor than systolic BP.
Low diastolic blood pressure — when to worry?
Excessively low diastolic BP (< 60 mmHg) may not adequately perfuse the heart during its resting phase — increasing heart attack risk in older adults. Low diastolic BP is common in the elderly or when over-treated with antihypertensive medications. Dizziness when standing (orthostatic hypotension) is a common symptom.
Why continuous diastolic BP monitoring matters
Blood pressure varies significantly throughout the day: typically lowest during sleep and highest in the early morning ("morning surge"). A single clinic reading may miss nocturnal hypertension — a more dangerous variant because it has no symptoms. H-Core monitors blood pressure continuously 24/7, helping detect nocturnal hypertension and morning surge — two critical factors traditional monitors miss.
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